configure

   1 #!/bin/sh
   2 # Based on the configure script from musl libc, MIT licensed
   3
   4 usage () {
   5 cat <<EOF
   6 Usage: $0 [OPTION]... [VAR=VALUE]...
   7
   8 To assign environment variables (e.g., CC, CFLAGS...), specify them as
   9 VAR=VALUE.  See below for descriptions of some of the useful variables.
  10
  11 Defaults for the options are specified in brackets.
  12
  13 Configuration:
  14   --srcdir=DIR            source directory [detected]
  15
  16 Installation directories:
  17   --prefix=PREFIX         main installation prefix [/usr/local]
  18   --exec-prefix=EPREFIX   installation prefix for executable files [PREFIX]
  19
  20 Fine tuning of the installation directories:
  21   --bindir=DIR            user executables [EPREFIX/bin]
  22   --sharedir=DIR          share directories [PREFIX/share]
  23   --docdir=DIR            misc. documentation [PREFIX/share/doc]
  24   --mandir=DIR            man pages [PREFIX/share/man]
  25
  26 Optional features:
  27   --enable-curses         build with Curses terminal output [yes]
  28   --enable-lua            build with Lua support [auto]
  29   --enable-lpeg-static    build with support for statically linked LPeg [auto]
  30   --enable-tre            build with TRE regex support [auto]
  31   --enable-selinux        build with SELinux support [auto]
  32   --enable-acl            build with POSIX ACL support [auto]
  33   --enable-help           build with built-in help texts [yes]
  34
  35 Some influential environment variables:
  36   CC                      C compiler command [detected]
  37   CFLAGS                  C compiler flags [-Os -pipe ...]
  38   LDFLAGS                 Linker flags
  39
  40 Use these variables to override the choices made by configure.
  41
  42 EOF
  43 exit 0
  44 }
  45
  46 # Helper functions
  47
  48 quote () {
  49 tr '\n' ' ' <<EOF | grep '^[-[:alnum:]_=,./:]* $' >/dev/null 2>&1 && { echo "$1" ; return 0 ; }
  50 $1
  51 EOF
  52 printf %s\\n "$1" | sed -e "s/'/'\\\\''/g" -e "1s/^/'/" -e "\$s/\$/'/" -e "s#^'\([-[:alnum:]_,./:]*\)=\(.*\)\$#\1='\2#"
  53 }
  54 echo () { printf "%s\n" "$*" ; }
  55 fail () { echo "$*" ; exit 1 ; }
  56 fnmatch () { eval "case \"\$2\" in $1) return 0 ;; *) return 1 ;; esac" ; }
  57 cmdexists () { type "$1" >/dev/null 2>&1 ; }
  58 trycc () { test -z "$CC" && cmdexists "$1" && CC=$1 ; }
  59
  60 stripdir () {
  61 while eval "fnmatch '*/' \"\${$1}\"" ; do eval "$1=\${$1%/}" ; done
  62 }
  63
  64 trycppif () {
  65 printf "checking preprocessor condition %s... " "$1"
  66 echo "typedef int x;" > "$tmpc"
  67 echo "#if $1" >> "$tmpc"
  68 echo "#error yes" >> "$tmpc"
  69 echo "#endif" >> "$tmpc"
  70 if $CC $2 -c -o "$tmpo" "$tmpc" >/dev/null 2>&1 ; then
  71 printf "false\n"
  72 return 1
  73 else
  74 printf "true\n"
  75 return 0
  76 fi
  77 }
  78
  79 tryflag () {
  80 printf "checking whether compiler accepts %s... " "$2"
  81 echo "typedef int x;" > "$tmpc"
  82 if $CC $CFLAGS_TRY $2 -c -o "$tmpo" "$tmpc" >/dev/null 2>&1 ; then
  83 printf "yes\n"
  84 eval "$1=\"\${$1} \$2\""
  85 eval "$1=\${$1# }"
  86 return 0
  87 else
  88 printf "no\n"
  89 return 1
  90 fi
  91 }
  92
  93 tryldflag () {
  94 printf "checking whether linker accepts %s... " "$2"
  95 echo "typedef int x;" > "$tmpc"
  96 if $CC $LDFLAGS_TRY -nostdlib -shared "$2" -o "$tmpo" "$tmpc" >/dev/null 2>&1 ; then
  97 printf "yes\n"
  98 eval "$1=\"\${$1} \$2\""
  99 eval "$1=\${$1# }"
 100 return 0
 101 else
 102 printf "no\n"
 103 return 1
 104 fi
 105 }
 106
 107 # Beginning of actual script
 108
 109 CFLAGS_AUTO=
 110 CFLAGS_TRY=
 111 LDFLAGS_AUTO=
 112 LDFLAGS_TRY=
 113 SRCDIR=
 114 PREFIX=/usr/local
 115 EXEC_PREFIX='$(PREFIX)'
 116 BINDIR='$(EXEC_PREFIX)/bin'
 117 SHAREDIR='$(PREFIX)/share'
 118 DOCDIR='$(PREFIX)/share/doc'
 119 MANDIR='$(PREFIX)/share/man'
 120
 121 help=yes
 122 curses=yes
 123 lua=auto
 124 lpeg=auto
 125 tre=auto
 126 selinux=auto
 127 acl=auto
 128
 129 for arg ; do
 130 case "$arg" in
 131 --help|-h) usage ;;
 132 --srcdir=*) SRCDIR=${arg#*=} ;;
 133 --prefix=*) PREFIX=${arg#*=} ;;
 134 --exec-prefix=*) EXEC_PREFIX=${arg#*=} ;;
 135 --bindir=*) BINDIR=${arg#*=} ;;
 136 --sharedir=*) SHAREDIR=${arg#*=} ;;
 137 --docdir=*) DOCDIR=${arg#*=} ;;
 138 --mandir=*) MANDIR=${arg#*=} ;;
 139 --environment-only) environmentonly=yes ;;
 140 --static) static=yes ;;
 141 --enable-help|--enable-help=yes) help=yes ;;
 142 --disable-help|--enable-help=no) help=no ;;
 143 --enable-curses|--enable-curses=yes) curses=yes ;;
 144 --disable-curses|--enable-curses=no) curses=no ;;
 145 --enable-lua|--enable-lua=yes) lua=yes ;;
 146 --disable-lua|--enable-lua=no) lua=no ;;
 147 --enable-lpeg-static|--enable-lpeg-static=yes) lpeg=yes ;;
 148 --disable-lpeg-static|--enable-lpeg-static=no) lpeg=no ;;
 149 --enable-tre|--enable-tre=yes) tre=yes ;;
 150 --disable-tre|--enable-tre=no) tre=no ;;
 151 --enable-selinux|--enable-selinux=yes) selinux=yes ;;
 152 --disable-selinux|--enable-selinux=no) selinux=no ;;
 153 --enable-acl|--enable-acl=yes) acl=yes ;;
 154 --disable-acl|--enable-acl=no) acl=no ;;
 155 --enable-*|--disable-*|--with-*|--without-*|--*dir=*|--build=*) ;;
 156 -* ) echo "$0: unknown option $arg" ;;
 157 CC=*) CC=${arg#*=} ;;
 158 CFLAGS=*) CFLAGS=${arg#*=} ;;
 159 CPPFLAGS=*) CPPFLAGS=${arg#*=} ;;
 160 LDFLAGS=*) LDFLAGS=${arg#*=} ;;
 161 *=*) ;;
 162 *) ;;
 163 esac
 164 done
 165
 166 for i in SRCDIR PREFIX EXEC_PREFIX BINDIR SHAREDIR DOCDIR MANDIR ; do
 167 stripdir $i
 168 done
 169
 170 #
 171 # Get the source dir for out-of-tree builds
 172 #
 173 if test -z "$SRCDIR" ; then
 174 SRCDIR="${0%/configure}"
 175 stripdir SRCDIR
 176 fi
 177 abs_builddir="$(pwd)" || fail "$0: cannot determine working directory"
 178 abs_srcdir="$(cd $SRCDIR && pwd)" || fail "$0: invalid source directory $SRCDIR"
 179 test "$abs_srcdir" = "$abs_builddir" && SRCDIR=.
 180 test "$SRCDIR" != "." -a -f Makefile -a ! -h Makefile && fail "$0: Makefile already exists in the working directory"
 181
 182 #
 183 # Get a temp filename we can use
 184 #
 185 i=0
 186 set -C
 187 while : ; do i=$(($i+1))
 188 tmpc="./conf$$-$PPID-$i.c"
 189 tmpo="./conf$$-$PPID-$i.o"
 190 2>|/dev/null > "$tmpc" && break
 191 test "$i" -gt 50 && fail "$0: cannot create temporary file $tmpc"
 192 done
 193 set +C
 194 trap 'rm -f "$tmpc" "$tmpo"' EXIT INT QUIT TERM HUP
 195
 196 #
 197 # Find a C compiler to use
 198 #
 199 printf "checking for C compiler... "
 200 trycc cc
 201 trycc gcc
 202 trycc clang
 203 printf "%s\n" "$CC"
 204 test -n "$CC" || { echo "$0: cannot find a C compiler" ; exit 1 ; }
 205
 206 printf "checking whether C compiler works... "
 207 echo "typedef int x;" > "$tmpc"
 208 if output=$($CC $CPPFLAGS $CFLAGS -c -o "$tmpo" "$tmpc" 2>&1) ; then
 209 printf "yes\n"
 210 else
 211 printf "no; compiler output follows:\n%s\n" "$output"
 212 exit 1
 213 fi
 214
 215 #
 216 # Figure out options to force errors on unknown flags.
 217 #
 218 tryflag   CFLAGS_TRY  -Werror=unknown-warning-option
 219 tryflag   CFLAGS_TRY  -Werror=unused-command-line-argument
 220 tryldflag LDFLAGS_TRY -Werror=unknown-warning-option
 221 tryldflag LDFLAGS_TRY -Werror=unused-command-line-argument
 222
 223 CFLAGS_STD="-std=c99 -D_POSIX_C_SOURCE=200809L -D_XOPEN_SOURCE=700 -DNDEBUG -D_FORTIFY_SOURCE=2"
 224 LDFLAGS_STD="-lc"
 225
 226 OS=$(uname)
 227
 228 case "$OS" in
 229 FreeBSD) CFLAGS_STD="$CFLAGS_STD -D_BSD_SOURCE -D__BSD_VISIBLE=1" ;;
 230 *BSD)    CFLAGS_STD="$CFLAGS_STD -D_BSD_SOURCE" ;;
 231 Darwin)  CFLAGS_STD="$CFLAGS_STD -D_DARWIN_C_SOURCE" ;;
 232 AIX)     CFLAGS_STD="$CFLAGS_STD -D_ALL_SOURCE" ;;
 233 esac
 234
 235 tryflag CFLAGS -pipe
 236
 237 # Try flags to optimize binary size
 238 tryflag CFLAGS -Os
 239 tryflag CFLAGS -ffunction-sections
 240 tryflag CFLAGS -fdata-sections
 241 tryldflag LDFLAGS_AUTO -Wl,--gc-sections
 242
 243 # Try hardening flags
 244 tryflag CFLAGS -fPIE
 245 tryflag CFLAGS_AUTO -fstack-protector-all
 246 tryldflag LDFLAGS -Wl,-z,now
 247 tryldflag LDFLAGS -Wl,-z,relro
 248 # in theory it should be perfectly fine to produce a staticically linked PIE
 249 # however in practice it is not yet properly supported by gcc:
 250 #
 251 #  cc -fPIE -pie --static
 252 #
 253 # will always add a PT_INTERP referencing the dynamic loader/linker
 254 if test "$static" != "yes" || tryldflag LDFLAGS_AUTO -Wl,--no-dynamic-linker ; then
 255         tryldflag LDFLAGS_AUTO -pie
 256 fi
 257
 258 printf "creating config.mk... "
 259
 260 cmdline=$(quote "$0")
 261 for i ; do cmdline="$cmdline $(quote "$i")" ; done
 262
 263 exec 3>&1 1>config.mk
 264
 265 cat << EOF
 266 # This version of config.mk was generated by:
 267 # $cmdline
 268 # Any changes made here will be lost if configure is re-run
 269 SRCDIR = $SRCDIR
 270 PREFIX = $PREFIX
 271 EXEC_PREFIX = $EXEC_PREFIX
 272 BINDIR = $BINDIR
 273 DOCPREFIX = $DOCDIR
 274 MANPREFIX = $MANDIR
 275 SHAREPREFIX = $SHAREDIR
 276 CC = $CC
 277 CFLAGS = $CFLAGS
 278 LDFLAGS = $LDFLAGS
 279 CFLAGS_STD = $CFLAGS_STD
 280 LDFLAGS_STD = $LDFLAGS_STD
 281 CFLAGS_AUTO = $CFLAGS_AUTO
 282 LDFLAGS_AUTO = $LDFLAGS_AUTO
 283 CFLAGS_DEBUG = -U_FORTIFY_SOURCE -UNDEBUG -O0 -g -ggdb -Wall -Wextra -pedantic -Wno-missing-field-initializers -Wno-unused-parameter
 284 EOF
 285 exec 1>&3 3>&-
 286
 287 printf "done\n"
 288
 289 if test "$environmentonly" = "yes"; then
 290         exit 0
 291 fi
 292
 293 have_pkgconfig=no
 294 printf "checking for pkg-config... "
 295 cmdexists pkg-config && have_pkgconfig=yes
 296 printf "%s\n" "$have_pkgconfig"
 297
 298 if test "$help" = "yes" ; then
 299         CONFIG_HELP=1
 300 else
 301         CONFIG_HELP=0
 302 fi
 303
 304 CONFIG_CURSES=0
 305
 306 if test "$curses" != "no" ; then
 307
 308         printf "checking for libcurses...\n"
 309
 310 cat > "$tmpc" <<EOF
 311 #include <curses.h>
 312
 313 int main(int argc, char *argv[]) {
 314         initscr();
 315         endwin();
 316         return 0;
 317 }
 318 EOF
 319
 320         for libcurses in ncursesw ncurses libcurses; do
 321                 printf " checking for %s... " "$libcurses"
 322
 323                 if test "$have_pkgconfig" = "yes" ; then
 324                         CFLAGS_CURSES=$(pkg-config --cflags $libcurses 2>/dev/null)
 325                         LDFLAGS_CURSES=$(pkg-config --libs $libcurses 2>/dev/null)
 326                         if test $? -eq 0 && $CC $CFLAGS $CFLAGS_CURSES "$tmpc" \
 327                                 $LDFLAGS $LDFLAGS_CURSES -o "$tmpo" >/dev/null 2>&1 ; then
 328                                 CONFIG_CURSES=1
 329                                 printf "yes\n"
 330                                 break
 331                         fi
 332                 fi
 333
 334                 CFLAGS_CURSES=""
 335                 LDFLAGS_CURSES="-l$libcurses"
 336
 337                 if $CC $CFLAGS $CFLAGS_CURSES "$tmpc" \
 338                         $LDFLAGS $LDFLAGS_CURSES -o "$tmpo" >/dev/null 2>&1 ; then
 339                         CONFIG_CURSES=1
 340                         printf "yes\n"
 341                         break
 342                 else
 343                         CFLAGS_CURSES=""
 344                         LDFLAGS_CURSES=""
 345                         printf "no\n"
 346                 fi
 347         done
 348
 349         test "$curses" = "yes" -a $CONFIG_CURSES -ne 1 && fail "$0: cannot find libcurses"
 350 fi
 351
 352 # libtermkey is a mandatory dependency
 353
 354 printf "checking for libtermkey... "
 355 cat > "$tmpc" <<EOF
 356 #include <termkey.h>
 357
 358 int main(int argc, char *argv[]) {
 359         TERMKEY_CHECK_VERSION;
 360         return 0;
 361 }
 362 EOF
 363
 364 if test "$have_pkgconfig" = "yes" ; then
 365         CFLAGS_TERMKEY=$(pkg-config --cflags termkey 2>/dev/null)
 366         LDFLAGS_TERMKEY=$(pkg-config --libs termkey 2>/dev/null)
 367 fi
 368
 369 if test -z "$LDFLAGS_TERMKEY"; then
 370         CFLAGS_TERMKEY=""
 371         LDFLAGS_TERMKEY="-ltermkey -lncursesw"
 372 fi
 373
 374 if $CC $CFLAGS $CFLAGS_TERMKEY "$tmpc" $LDFLAGS $LDFLAGS_TERMKEY $LDFLAGS_CURSES \
 375         -o "$tmpo" >/dev/null 2>&1; then
 376         printf "%s\n" "yes"
 377 else
 378         printf "%s\n" "no"
 379         fail "$0: cannot find libtermkey"
 380 fi
 381
 382 CONFIG_TRE=0
 383 REGEX_SRC=text-regex.c
 384
 385 if test "$tre" != "no" ; then
 386
 387         printf "checking for libtre... "
 388
 389 cat > "$tmpc" <<EOF
 390 #include <tre/tre.h>
 391
 392 int main() {
 393         regex_t preg;
 394         tre_str_source *source = NULL;
 395         regmatch_t pmatch[1];
 396         tre_regcomp(&preg, "\0", REG_EXTENDED);
 397         tre_reguexec(&preg, source, 1, pmatch, 0);
 398         tre_regfree(&preg);
 399         return 0;
 400 }
 401 EOF
 402
 403         if test "$have_pkgconfig" = "yes" ; then
 404                 CFLAGS_TRE=$(pkg-config --cflags tre 2>/dev/null)
 405                 LDFLAGS_TRE=$(pkg-config --libs tre 2>/dev/null)
 406         fi
 407
 408         if test -z "$LDFLAGS_TRE"; then
 409                 CFLAGS_TRE=""
 410                 LDFLAGS_TRE="-ltre"
 411         fi
 412
 413         if $CC $CFLAGS $CFLAGS_TRE "$tmpc" \
 414                 $LDFLAGS $LDFLAGS_TRE -o "$tmpo" >/dev/null 2>&1; then
 415                 CONFIG_TRE=1
 416                 REGEX_SRC=text-regex-tre.c
 417                 printf "%s\n" "yes"
 418         else
 419                 printf "%s\n" "no"
 420                 CFLAGS_TRE=""
 421                 LDFLAGS_TRE=""
 422                 test "$tre" = "yes" && fail "$0: cannot find libtre"
 423         fi
 424 fi
 425
 426 CONFIG_LUA=0
 427
 428 # enabling builtin lpeg requires lua support
 429 test "$lpeg" = "yes" -a "$lua" = "no" && fail "$0: need lua support for built-in lpeg"
 430 test "$lpeg" = "yes" && lua=yes
 431
 432 if test "$lua" != "no" ; then
 433
 434         printf "checking for liblua >= 5.2 ...\n"
 435
 436 cat > "$tmpc" <<EOF
 437 #include <lua.h>
 438 #include <lauxlib.h>
 439
 440 #if LUA_VERSION_NUM < 502
 441 #error "Need at least Lua 5.2"
 442 #endif
 443
 444 int main(int argc, char *argv[]) {
 445         lua_State *L = luaL_newstate();
 446         luaL_openlibs(L);
 447         lua_close(L);
 448         return 0;
 449 }
 450 EOF
 451
 452         for liblua in lua lua5.3 lua5.2 lua-5.3 lua-5.2 lua53 lua52; do
 453                 printf " checking for %s... " "$liblua"
 454
 455                 if test "$have_pkgconfig" = "yes" ; then
 456                         CFLAGS_LUA=$(pkg-config --cflags $liblua 2>/dev/null)
 457                         LDFLAGS_LUA=$(pkg-config --libs $liblua 2>/dev/null)
 458                         if test $? -eq 0 && $CC $CFLAGS $CFLAGS_LUA "$tmpc" \
 459                                 $LDFLAGS $LDFLAGS_LUA -o "$tmpo" >/dev/null 2>&1 ; then
 460                                 CONFIG_LUA=1
 461                                 printf "yes\n"
 462                                 break
 463                         fi
 464                 fi
 465
 466                 CFLAGS_LUA=""
 467                 LDFLAGS_LUA="-l$liblua -lm -ldl"
 468
 469                 if $CC $CFLAGS $CFLAGS_LUA "$tmpc" \
 470                         $LDFLAGS $LDFLAGS_LUA -o "$tmpo" >/dev/null 2>&1 ; then
 471                         CONFIG_LUA=1
 472                         printf "yes\n"
 473                         break
 474                 else
 475                         printf "no\n"
 476                         CFLAGS_LUA=""
 477                         LDFLAGS_LUA=""
 478                 fi
 479         done
 480
 481         test "$lua" = "yes" -a $CONFIG_LUA -ne 1 && fail "$0: cannot find liblua"
 482
 483         if test $CONFIG_LUA -eq 1; then
 484                 CFLAGS_LUA="$CFLAGS_LUA -DLUA_COMPAT_5_1 -DLUA_COMPAT_5_2 -DLUA_COMPAT_ALL"
 485         fi
 486 fi
 487
 488 CONFIG_LPEG=0
 489
 490 if test $CONFIG_LUA -eq 1 -a "$lpeg" != "no" ; then
 491
 492         printf "checking for statically linked liblpeg ... "
 493
 494 cat > "$tmpc" <<EOF
 495 #include <lua.h>
 496 #include <lauxlib.h>
 497
 498 int main(int argc, char *argv[]) {
 499         lua_State *L = luaL_newstate();
 500         luaL_openlibs(L);
 501         extern int luaopen_lpeg(lua_State *L);
 502         lua_getglobal(L, "package");
 503         lua_getfield(L, -1, "preload");
 504         lua_pushcfunction(L, luaopen_lpeg);
 505         lua_setfield(L, -2, "lpeg");
 506         lua_pop(L, 2);
 507         lua_close(L);
 508         return 0;
 509 }
 510 EOF
 511
 512         CFLAGS_LPEG=""
 513         LDFLAGS_LPEG="-llpeg"
 514
 515         if $CC $CFLAGS $CFLAGS_LUA $CFLAGS_LPEG "$tmpc" \
 516                 $LDFLAGS $LDFLAGS_LUA $LDFLAGS_LPEG -o "$tmpo" >/dev/null 2>&1 ; then
 517                 CONFIG_LPEG=1
 518                 printf "yes\n"
 519                 break
 520         else
 521                 printf "no\n"
 522                 CFLAGS_LPEG=""
 523                 LDFLAGS_LPEG=""
 524         fi
 525
 526         test "$lpeg" = "yes" -a $CONFIG_LPEG -ne 1 && fail "$0: cannot find liblpeg"
 527 fi
 528
 529 CONFIG_ACL=0
 530
 531 if test "$OS" = "Linux" -a "$acl" != "no"; then
 532         printf "checking for libacl... "
 533
 534 cat > "$tmpc" <<EOF
 535 #include <sys/types.h>
 536 #include <sys/acl.h>
 537
 538 int main(int argc, char *argv[]) {
 539         acl_t acl = acl_get_fd(0);
 540         return 0;
 541 }
 542 EOF
 543
 544         if test "$have_pkgconfig" = "yes" ; then
 545                 CFLAGS_ACL=$(pkg-config --cflags acl 2>/dev/null)
 546                 LDFLAGS_ACL=$(pkg-config --libs acl 2>/dev/null)
 547         fi
 548
 549         if test -z "$LDFLAGS_ACL"; then
 550                 CFLAGS_ACL=""
 551                 LDFLAGS_ACL="-lacl"
 552         fi
 553
 554         if $CC $CFLAGS $CFLAGS_ACL "$tmpc" \
 555                 $LDFLAGS $LDFLAGS_ACL -o "$tmpo" >/dev/null 2>&1; then
 556                 CONFIG_ACL=1
 557                 printf "%s\n" "yes"
 558         else
 559                 printf "%s\n" "no"
 560                 CFLAGS_ACL=""
 561                 LDFLAGS_ACL=""
 562                 test "$acl" = "yes" && fail "$0: cannot find libacl"
 563         fi
 564 fi
 565
 566 CONFIG_SELINUX=0
 567
 568 if test "$OS" = "Linux" -a "$selinux" != "no"; then
 569         printf "checking for libselinux... "
 570
 571 cat > "$tmpc" <<EOF
 572 #include <selinux/selinux.h>
 573
 574 int main(int argc, char *argv[]) {
 575         return is_selinux_enabled();
 576 }
 577 EOF
 578
 579         if test "$have_pkgconfig" = "yes" ; then
 580                 CFLAGS_SELINUX=$(pkg-config --cflags selinux 2>/dev/null)
 581                 LDFLAGS_SELINUX=$(pkg-config --libs selinux 2>/dev/null)
 582         fi
 583
 584         if test -z "$LDFLAGS_SELINUX"; then
 585                 CFLAGS_SELINUX=""
 586                 LDFLAGS_SELINUX="-lselinux"
 587         fi
 588
 589         if $CC $CFLAGS $CFLAGS_SELINUX "$tmpc" \
 590                 $LDFLAGS $LDFLAGS_SELINUX -o "$tmpo" >/dev/null 2>&1; then
 591                 CONFIG_SELINUX=1
 592                 printf "%s\n" "yes"
 593         else
 594                 printf "%s\n" "no"
 595                 CFLAGS_SELINUX=""
 596                 LDFLAGS_SELINUX=""
 597                 test "$selinux" = "yes" && fail "$0: cannot find libselinux"
 598         fi
 599 fi
 600
 601 printf "checking for memrchr... "
 602
 603 cat > "$tmpc" <<EOF
 604 #define _GNU_SOURCE
 605 #include <string.h>
 606
 607 int main(int argc, char *argv[]) {
 608         return !memrchr("\n", '\n', 1);
 609 }
 610 EOF
 611
 612 if $CC $CFLAGS "$tmpc" $LDFLAGS -o "$tmpo" >/dev/null 2>&1; then
 613         HAVE_MEMRCHR=1
 614         printf "%s\n" "yes"
 615 else
 616         HAVE_MEMRCHR=0
 617         printf "%s\n" "no"
 618 fi
 619
 620 printf "completing config.mk... "
 621
 622 exec 3>&1 1>>config.mk
 623
 624 cat << EOF
 625 CONFIG_HELP = $CONFIG_HELP
 626 CFLAGS_TERMKEY = $CFLAGS_TERMKEY
 627 LDFLAGS_TERMKEY = $LDFLAGS_TERMKEY
 628 CONFIG_CURSES = $CONFIG_CURSES
 629 CFLAGS_CURSES = $CFLAGS_CURSES
 630 LDFLAGS_CURSES = $LDFLAGS_CURSES
 631 REGEX_SRC = $REGEX_SRC
 632 CONFIG_TRE = $CONFIG_TRE
 633 CFLAGS_TRE = $CFLAGS_TRE
 634 LDFLAGS_TRE = $LDFLAGS_TRE
 635 CONFIG_LUA = $CONFIG_LUA
 636 CFLAGS_LUA = $CFLAGS_LUA
 637 LDFLAGS_LUA = $LDFLAGS_LUA
 638 CONFIG_LPEG = $CONFIG_LPEG
 639 CFLAGS_LPEG = $CFLAGS_LPEG
 640 LDFLAGS_LPEG = $LDFLAGS_LPEG
 641 CONFIG_ACL = $CONFIG_ACL
 642 CFLAGS_ACL = $CFLAGS_ACL
 643 LDFLAGS_ACL = $LDFLAGS_ACL
 644 CONFIG_SELINUX = $CONFIG_SELINUX
 645 CFLAGS_SELINUX = $CFLAGS_SELINUX
 646 LDFLAGS_SELINUX = $LDFLAGS_SELINUX
 647 CFLAGS_LIBC = -DHAVE_MEMRCHR=$HAVE_MEMRCHR
 648 EOF
 649 exec 1>&3 3>&-
 650
 651 test "$SRCDIR" = "." || ln -sf $SRCDIR/Makefile .
 652
 653 printf "done\n"