AC_PREREQ(2.57) dnl Version not hardcoded here. Fetched later from ares_version.h AC_INIT([c-ares], [-], [c-ares mailing list => http://cool.haxx.se/mailman/listinfo/c-ares]) AC_CONFIG_SRCDIR([ares_ipv6.h]) AM_CONFIG_HEADER([config.h]) AM_MAINTAINER_MODE CARES_CHECK_OPTION_DEBUG CARES_CHECK_OPTION_WARNINGS dnl SED is mandatory for configure process and libtool. dnl Set it now, allowing it to be changed later. AC_PATH_PROG([SED], [sed], [not_found], [$PATH:/usr/bin:/usr/local/bin]) if test -z "$SED" || test "$SED" = "not_found"; then AC_MSG_ERROR([sed not found in PATH. Cannot continue without sed.]) fi AC_SUBST([SED]) dnl GREP is mandatory for configure process and libtool. dnl Set it now, allowing it to be changed later. AC_PATH_PROG([GREP], [grep], [not_found], [$PATH:/usr/bin:/usr/local/bin]) if test -z "$GREP" || test "$GREP" = "not_found"; then AC_MSG_ERROR([grep not found in PATH. Cannot continue without grep.]) fi AC_SUBST([GREP]) dnl EGREP is mandatory for configure process and libtool. dnl Set it now, allowing it to be changed later. if echo a | ($GREP -E '(a|b)') >/dev/null 2>&1; then AC_MSG_CHECKING([for egrep]) EGREP="$GREP -E" AC_MSG_RESULT([$EGREP]) else AC_PATH_PROG([EGREP], [egrep], [not_found], [$PATH:/usr/bin:/usr/local/bin]) fi if test -z "$EGREP" || test "$EGREP" = "not_found"; then AC_MSG_ERROR([egrep not found in PATH. Cannot continue without egrep.]) fi AC_SUBST([EGREP]) dnl AR is mandatory for configure process and libtool. dnl This is target dependant, so check it as a tool. AC_PATH_TOOL([AR], [ar], [not_found], [$PATH:/usr/bin:/usr/local/bin]) if test -z "$AR" || test "$AR" = "not_found"; then AC_MSG_ERROR([ar not found in PATH. Cannot continue without ar.]) fi AC_SUBST([AR]) dnl Fetch c-ares version from ares_version.h VERSION=`$SED -ne 's/^#define ARES_VERSION_STR "\(.*\)"/\1/p' ${srcdir}/ares_version.h` AM_INIT_AUTOMAKE([c-ares], [$VERSION]) AC_MSG_CHECKING([c-ares version]) AC_MSG_RESULT([$VERSION]) dnl dnl Detect the canonical host and target build environment dnl AC_CANONICAL_HOST dnl Get system canonical name AC_DEFINE_UNQUOTED(OS, "${host}", [cpu-machine-OS]) AC_PROG_CC AM_PROG_CC_C_O AC_PROG_INSTALL dnl This defines _ALL_SOURCE for AIX CARES_CHECK_AIX_ALL_SOURCE dnl Our configure and build reentrant settings CARES_CONFIGURE_REENTRANT dnl check for how to do large files AC_SYS_LARGEFILE case $host_os in solaris*) AC_DEFINE(ETC_INET, 1, [if a /etc/inet dir is being used]) ;; esac dnl support building of Windows DLLs AC_LIBTOOL_WIN32_DLL CARES_PROCESS_DEBUG_BUILD_OPTS AM_CONDITIONAL(DEBUGBUILD, test x$want_debug = xyes) AM_CONDITIONAL(CURLDEBUG, test x$want_debug = xyes) dnl skip libtool C++ and Fortran compiler checks m4_ifdef([AC_PROG_CXX], [m4_undefine([AC_PROG_CXX])]) m4_defun([AC_PROG_CXX],[]) m4_ifdef([AC_PROG_CXXCPP], [m4_undefine([AC_PROG_CXXCPP])]) m4_defun([AC_PROG_CXXCPP],[true]) m4_ifdef([AC_PROG_F77], [m4_undefine([AC_PROG_F77])]) m4_defun([AC_PROG_F77],[]) dnl skip libtool C++ and Fortran linker checks m4_ifdef([AC_LIBTOOL_CXX], [m4_undefine([AC_LIBTOOL_CXX])]) m4_defun([AC_LIBTOOL_CXX],[]) m4_ifdef([AC_LIBTOOL_CXXCPP], [m4_undefine([AC_LIBTOOL_CXXCPP])]) m4_defun([AC_LIBTOOL_CXXCPP],[true]) m4_ifdef([AC_LIBTOOL_F77], [m4_undefine([AC_LIBTOOL_F77])]) m4_defun([AC_LIBTOOL_F77],[]) dnl force libtool to build static libraries with PIC on AMD64-Linux & FreeBSD AC_MSG_CHECKING([if arch-OS host is AMD64-Linux/FreeBSD (to build static libraries with PIC)]) case $host in x86_64*linux*|amd64*freebsd*|ia64*freebsd*) AC_MSG_RESULT([yes]) with_pic=yes ;; *) AC_MSG_RESULT([no]) ;; esac dnl libtool setup AC_PROG_LIBTOOL AC_MSG_CHECKING([if we need -no-undefined]) case $host in *-*-cygwin* | *-*-mingw* | *-*-pw32* | *-*-cegcc*) need_no_undefined=yes ;; *) need_no_undefined=no ;; esac AC_MSG_RESULT($need_no_undefined) AM_CONDITIONAL(NO_UNDEFINED, test x$need_no_undefined = xyes) dnl ********************************************************************** dnl platform/compiler/architecture specific checks/flags dnl ********************************************************************** CARES_CHECK_COMPILER CARES_PROCESS_CC_BASIC_OPTS CARES_PROCESS_CC_DEBUG_OPTS CARES_PROCESS_CC_WARNING_OPTS case $host in # x86_64*linux*|amd64*freebsd*|ia64*freebsd*) # if test "$compiler_id" = "ICC_unix"; then # if test "$compiler_num" -ge "900" && test "$compiler_num" -lt "1000"; then dnl icc 9.X specific CFLAGS="$CFLAGS -i-dynamic" fi # if test "$compiler_num" -ge "1000"; then dnl icc 10.X or later CFLAGS="$CFLAGS -shared-intel" fi # fi ;; # esac CURL_CHECK_COMPILER_HALT_ON_ERROR CURL_CHECK_COMPILER_ARRAY_SIZE_NEGATIVE dnl ********************************************************************** dnl Compilation based checks should not be done before this point. dnl ********************************************************************** dnl ********************************************************************** dnl Make sure that our checks for headers windows.h winsock.h winsock2.h dnl and ws2tcpip.h take precedence over any other further checks which dnl could be done later using AC_CHECK_HEADER or AC_CHECK_HEADERS for dnl this specific header files. And do them before its results are used. dnl ********************************************************************** CURL_CHECK_HEADER_WINDOWS CURL_CHECK_NATIVE_WINDOWS case X-"$ac_cv_native_windows" in X-yes) CURL_CHECK_HEADER_WINSOCK CURL_CHECK_HEADER_WINSOCK2 CURL_CHECK_HEADER_WS2TCPIP ;; *) ac_cv_header_winsock_h="no" ac_cv_header_winsock2_h="no" ac_cv_header_ws2tcpip_h="no" ;; esac dnl ********************************************************************** dnl Checks for libraries. dnl ********************************************************************** dnl gethostbyname without lib or in the nsl lib? AC_CHECK_FUNC(gethostbyname, [HAVE_GETHOSTBYNAME="1" ], [ AC_CHECK_LIB(nsl, gethostbyname, [HAVE_GETHOSTBYNAME="1" LIBS="$LIBS -lnsl" ]) ]) if test "$HAVE_GETHOSTBYNAME" != "1" then dnl gethostbyname in the socket lib? AC_CHECK_LIB(socket, gethostbyname, [HAVE_GETHOSTBYNAME="1" LIBS="$LIBS -lsocket" ]) fi dnl At least one system has been identified to require BOTH nsl and socket dnl libs at the same time to link properly. if test "$HAVE_GETHOSTBYNAME" != "1" then AC_MSG_CHECKING([for gethostbyname with both nsl and socket libs]) my_ac_save_LIBS=$LIBS LIBS="-lnsl -lsocket $LIBS" AC_LINK_IFELSE([ AC_LANG_PROGRAM([[ ]],[[ gethostbyname(); ]]) ],[ AC_MSG_RESULT([yes]) HAVE_GETHOSTBYNAME="1" ],[ AC_MSG_RESULT([no]) LIBS=$my_ac_save_LIBS ]) fi if test "$HAVE_GETHOSTBYNAME" != "1" then dnl This is for winsock systems if test "$ac_cv_header_windows_h" = "yes"; then if test "$ac_cv_header_winsock_h" = "yes"; then case $host in *-*-mingw32ce*) winsock_LIB="-lwinsock" ;; *) winsock_LIB="-lwsock32" ;; esac fi if test "$ac_cv_header_winsock2_h" = "yes"; then winsock_LIB="-lws2_32" fi if test ! -z "$winsock_LIB"; then my_ac_save_LIBS=$LIBS LIBS="$winsock_LIB $LIBS" AC_MSG_CHECKING([for gethostbyname in $winsock_LIB]) AC_LINK_IFELSE([ AC_LANG_PROGRAM([[ #ifdef HAVE_WINDOWS_H #ifndef WIN32_LEAN_AND_MEAN #define WIN32_LEAN_AND_MEAN #endif #include #ifdef HAVE_WINSOCK2_H #include #else #ifdef HAVE_WINSOCK_H #include #endif #endif #endif ]],[[ gethostbyname("www.dummysite.com"); ]]) ],[ AC_MSG_RESULT([yes]) HAVE_GETHOSTBYNAME="1" ],[ AC_MSG_RESULT([no]) winsock_LIB="" LIBS=$my_ac_save_LIBS ]) fi fi fi if test "$HAVE_GETHOSTBYNAME" != "1" then dnl This is for Minix 3.1 AC_MSG_CHECKING([for gethostbyname for Minix 3]) AC_LINK_IFELSE([ AC_LANG_PROGRAM([[ /* Older Minix versions may need here instead */ #include ]],[[ gethostbyname("www.dummysite.com"); ]]) ],[ AC_MSG_RESULT([yes]) HAVE_GETHOSTBYNAME="1" ],[ AC_MSG_RESULT([no]) ]) fi if test "$HAVE_GETHOSTBYNAME" != "1" then dnl This is for eCos with a stubbed DNS implementation AC_MSG_CHECKING([for gethostbyname for eCos]) AC_LINK_IFELSE([ AC_LANG_PROGRAM([[ #include #include ]],[[ gethostbyname("www.dummysite.com"); ]]) ],[ AC_MSG_RESULT([yes]) HAVE_GETHOSTBYNAME="1" ],[ AC_MSG_RESULT([no]) ]) fi if test "$HAVE_GETHOSTBYNAME" != "1" then dnl gethostbyname in the net lib - for BeOS AC_CHECK_LIB(net, gethostbyname, [HAVE_GETHOSTBYNAME="1" LIBS="$LIBS -lnet" ]) fi if test "$HAVE_GETHOSTBYNAME" = "1"; then AC_DEFINE(HAVE_GETHOSTBYNAME, 1, [If you have gethostbyname]) else AC_MSG_ERROR([couldn't find libraries for gethostbyname()]) fi dnl resolve lib? AC_CHECK_FUNC(strcasecmp, , [ AC_CHECK_LIB(resolve, strcasecmp) ]) if test "$ac_cv_lib_resolve_strcasecmp" = "$ac_cv_func_strcasecmp"; then AC_CHECK_LIB(resolve, strcasecmp, [LIBS="-lresolve $LIBS"], , -lnsl) fi ac_cv_func_strcasecmp="no" dnl socket lib? AC_CHECK_FUNC(connect, , [ AC_CHECK_LIB(socket, connect) ]) dnl ********************************************************************** dnl In case that function clock_gettime with monotonic timer is available, dnl check for additional required libraries. dnl ********************************************************************** CURL_CHECK_LIBS_CLOCK_GETTIME_MONOTONIC AC_MSG_CHECKING([whether to use libgcc]) AC_ARG_ENABLE(libgcc, AC_HELP_STRING([--enable-libgcc],[use libgcc when linking]), [ case "$enableval" in yes) LIBS="$LIBS -lgcc" AC_MSG_RESULT(yes) ;; *) AC_MSG_RESULT(no) ;; esac ], AC_MSG_RESULT(no) ) dnl Default is to try the thread-safe versions of a few functions OPT_THREAD=on dnl detect AIX 4.3 or later AC_MSG_CHECKING([AIX 4.3 or later]) AC_PREPROC_IFELSE([ #if defined(_AIX) && defined(_AIX43) printf("just fine"); #else #error "this is not AIX 4.3 or later" #endif ], [ AC_MSG_RESULT([yes]) RECENTAIX=yes OPT_THREAD=off ], [ AC_MSG_RESULT([no]) ] ) AC_ARG_ENABLE(thread,dnl AC_HELP_STRING([--disable-thread],[don't look for thread-safe functions]) AC_HELP_STRING([--enable-thread],[look for thread-safe functions]), [ case "$enableval" in no) OPT_THREAD=off AC_MSG_WARN(c-ares will not get built using thread-safe functions) ;; *) ;; esac ] ) if test X"$OPT_THREAD" = Xoff then AC_DEFINE(DISABLED_THREADSAFE, 1, [Set to explicitly specify we don't want to use thread-safe functions]) fi dnl for recent AIX versions, we skip all the thread-safe checks above since dnl they claim a thread-safe libc using the standard API. But there are dnl some functions still not thread-safe. Check for these! dnl Let's hope this split URL remains working: dnl http://publibn.boulder.ibm.com/doc_link/en_US/a_doc_lib/aixprggd/ \ dnl genprogc/thread_quick_ref.htm if test "x$RECENTAIX" = "xyes"; then AC_DEFINE(_THREAD_SAFE, 1, [define this if you need it to compile thread-safe code]) fi dnl ********************************************************************** dnl Back to "normal" configuring dnl ********************************************************************** dnl Checks for header files. AC_HEADER_STDC CURL_CHECK_HEADER_MALLOC dnl check for a few basic system headers we need AC_CHECK_HEADERS( sys/types.h \ sys/time.h \ sys/select.h \ sys/socket.h \ sys/ioctl.h \ sys/param.h \ sys/uio.h \ netdb.h \ netinet/in.h \ netinet/tcp.h \ net/if.h \ errno.h \ strings.h \ stdbool.h \ time.h \ arpa/nameser.h \ arpa/nameser_compat.h \ arpa/inet.h, dnl to do if not found [], dnl to do if found [], dnl default includes [ #ifdef HAVE_SYS_TYPES_H #include #endif #ifdef HAVE_SYS_TIME_H #include #endif dnl We do this default-include simply to make sure that the nameser_compat.h dnl header *REALLY* can be include after the new nameser.h. It seems AIX 5.1 dnl (and others?) is not designed to allow this. #ifdef HAVE_ARPA_NAMESER_H #include #endif dnl *Sigh* these are needed in order for net/if.h to get properly detected. #ifdef HAVE_SYS_SOCKET_H #include #endif #ifdef HAVE_NETINET_IN_H #include #endif ] ) dnl Checks for typedefs, structures, and compiler characteristics. AC_C_CONST AC_TYPE_SIZE_T AC_HEADER_TIME CURL_CHECK_STRUCT_TIMEVAL AC_CHECK_SIZEOF(size_t) AC_CHECK_SIZEOF(long) AC_CHECK_SIZEOF(time_t) AC_CHECK_TYPE(long long, [AC_DEFINE(HAVE_LONGLONG, 1, [Define to 1 if the compiler supports the 'long long' data type.])] longlong="yes" ) if test "xyes" = "x$longlong"; then AC_MSG_CHECKING([if numberLL works]) AC_COMPILE_IFELSE([long long val = 1000LL;], [AC_DEFINE(HAVE_LL, 1, [if your compiler supports LL])] AC_MSG_RESULT(yes), AC_MSG_RESULT(no) ) fi # check for ssize_t AC_CHECK_TYPE(ssize_t, , AC_DEFINE(ssize_t, int, [the signed version of size_t])) # check for bool type AC_CHECK_TYPE([bool],[ AC_DEFINE(HAVE_BOOL_T, 1, [Define to 1 if bool is an available type.]) ], ,[ #ifdef HAVE_SYS_TYPES_H #include #endif #ifdef HAVE_STDBOOL_H #include #endif ]) # Check for socklen_t or equivalent CURL_CHECK_TYPE_SOCKLEN_T TYPE_IN_ADDR_T TYPE_SOCKADDR_STORAGE TYPE_SIG_ATOMIC_T AC_TYPE_SIGNAL CURL_CHECK_FUNC_RECV CURL_CHECK_FUNC_RECVFROM CURL_CHECK_FUNC_SEND CURL_CHECK_MSG_NOSIGNAL CARES_CHECK_FUNC_GETHOSTNAME CARES_CHECK_FUNC_GETSERVBYPORT_R CARES_CHECK_FUNC_INET_NTOP CARES_CHECK_FUNC_INET_PTON CARES_CHECK_FUNC_STRCASECMP CARES_CHECK_FUNC_STRCMPI CARES_CHECK_FUNC_STRDUP CARES_CHECK_FUNC_STRICMP CARES_CHECK_FUNC_STRNCASECMP CARES_CHECK_FUNC_STRNCMPI CARES_CHECK_FUNC_STRNICMP CARES_CHECK_FUNC_WRITEV dnl check for AF_INET6 CARES_CHECK_CONSTANT( [ #undef inline #ifdef HAVE_WINDOWS_H #ifndef WIN32_LEAN_AND_MEAN #define WIN32_LEAN_AND_MEAN #endif #include #ifdef HAVE_WINSOCK2_H #include #endif #else #ifdef HAVE_SYS_TYPES_H #include #endif #ifdef HAVE_SYS_SOCKET_H #include #endif #endif ], [PF_INET6], AC_DEFINE_UNQUOTED(HAVE_PF_INET6,1,[Define to 1 if you have PF_INET6.]) ) dnl check for PF_INET6 CARES_CHECK_CONSTANT( [ #undef inline #ifdef HAVE_WINDOWS_H #ifndef WIN32_LEAN_AND_MEAN #define WIN32_LEAN_AND_MEAN #endif #include #ifdef HAVE_WINSOCK2_H #include #endif #else #ifdef HAVE_SYS_TYPES_H #include #endif #ifdef HAVE_SYS_SOCKET_H #include #endif #endif ], [AF_INET6], AC_DEFINE_UNQUOTED(HAVE_AF_INET6,1,[Define to 1 if you have AF_INET6.]) ) dnl check for the in6_addr structure CARES_CHECK_STRUCT( [ #undef inline #ifdef HAVE_WINDOWS_H #ifndef WIN32_LEAN_AND_MEAN #define WIN32_LEAN_AND_MEAN #endif #include #ifdef HAVE_WINSOCK2_H #include #ifdef HAVE_WS2TCPIP_H #include #endif #endif #else #ifdef HAVE_SYS_TYPES_H #include #endif #ifdef HAVE_NETINET_IN_H #include #endif #endif ], [in6_addr], AC_DEFINE_UNQUOTED(HAVE_STRUCT_IN6_ADDR,1,[Define to 1 if you have struct in6_addr.]) ) dnl check for the sockaddr_in6 structure CARES_CHECK_STRUCT( [ #undef inline #ifdef HAVE_WINDOWS_H #ifndef WIN32_LEAN_AND_MEAN #define WIN32_LEAN_AND_MEAN #endif #include #ifdef HAVE_WINSOCK2_H #include #ifdef HAVE_WS2TCPIP_H #include #endif #endif #else #ifdef HAVE_SYS_TYPES_H #include #endif #ifdef HAVE_NETINET_IN_H #include #endif #endif ], [sockaddr_in6], AC_DEFINE_UNQUOTED(HAVE_STRUCT_SOCKADDR_IN6,1, [Define to 1 if you have struct sockaddr_in6.]) ac_have_sockaddr_in6=yes ) AC_CHECK_MEMBER(struct sockaddr_in6.sin6_scope_id, AC_DEFINE_UNQUOTED(HAVE_SOCKADDR_IN6_SIN6_SCOPE_ID,1, [Define to 1 if your struct sockaddr_in6 has sin6_scope_id.]) , , [ #undef inline #ifdef HAVE_WINDOWS_H #ifndef WIN32_LEAN_AND_MEAN #define WIN32_LEAN_AND_MEAN #endif #include #ifdef HAVE_WINSOCK2_H #include #ifdef HAVE_WS2TCPIP_H #include #endif #endif #else #ifdef HAVE_SYS_TYPES_H #include #endif #ifdef HAVE_NETINET_IN_H #include #endif #endif ]) dnl check for the addrinfo structure AC_CHECK_MEMBER(struct addrinfo.ai_flags, AC_DEFINE_UNQUOTED(HAVE_STRUCT_ADDRINFO,1, [Define to 1 if you have struct addrinfo.]),, [ #undef inline #ifdef HAVE_WINDOWS_H #ifndef WIN32_LEAN_AND_MEAN #define WIN32_LEAN_AND_MEAN #endif #include #ifdef HAVE_WINSOCK2_H #include #ifdef HAVE_WS2TCPIP_H #include #endif #endif #else #ifdef HAVE_SYS_TYPES_H #include #endif #ifdef HAVE_NETINET_IN_H #include #endif #ifdef HAVE_SYS_SOCKET_H #include #endif #ifdef HAVE_NETDB_H #include #endif #endif ] ) AC_CHECK_FUNCS([bitncmp \ gettimeofday \ if_indextoname ],[ ],[ func="$ac_func" AC_MSG_CHECKING([deeper for $func]) AC_LINK_IFELSE([ AC_LANG_PROGRAM([[ ]],[[ $func (); ]]) ],[ AC_MSG_RESULT([yes]) eval "ac_cv_func_$func=yes" AC_DEFINE_UNQUOTED([AS_TR_CPP([HAVE_$func])], [1], [Define to 1 if you have the $func function.]) ],[ AC_MSG_RESULT([but still no]) ]) ]) dnl Check for inet_net_pton AC_CHECK_FUNCS(inet_net_pton) dnl Again, some systems have it, but not IPv6 if test "$ac_cv_func_inet_net_pton" = "yes" ; then AC_MSG_CHECKING(if inet_net_pton supports IPv6) AC_TRY_RUN( [ #ifdef HAVE_SYS_TYPES_H #include #endif #ifdef HAVE_SYS_SOCKET_H #include #endif #ifdef HAVE_NETINET_IN_H #include #endif int main() { struct in6_addr addr6; if (inet_net_pton(AF_INET6, "::1", &addr6, sizeof(addr6)) < 1) exit(1); else exit(0); } ], [ AC_MSG_RESULT(yes) AC_DEFINE_UNQUOTED(HAVE_INET_NET_PTON_IPV6,1,[Define to 1 if inet_net_pton supports IPv6.]) ], AC_MSG_RESULT(no),AC_MSG_RESULT(no)) fi AC_CHECK_SIZEOF(struct in6_addr, , [ #undef inline #ifdef HAVE_WINDOWS_H #ifndef WIN32_LEAN_AND_MEAN #define WIN32_LEAN_AND_MEAN #endif #include #ifdef HAVE_WINSOCK2_H #include #ifdef HAVE_WS2TCPIP_H #include #endif #endif #else #ifdef HAVE_SYS_TYPES_H #include #endif #ifdef HAVE_SYS_SOCKET_H #include #endif #ifdef HAVE_NETINET_IN_H #include #endif #endif ] ) AC_CHECK_SIZEOF(struct in_addr, , [ #undef inline #ifdef HAVE_WINDOWS_H #ifndef WIN32_LEAN_AND_MEAN #define WIN32_LEAN_AND_MEAN #endif #include #ifdef HAVE_WINSOCK2_H #include #ifdef HAVE_WS2TCPIP_H #include #endif #endif #else #ifdef HAVE_SYS_TYPES_H #include #endif #ifdef HAVE_SYS_SOCKET_H #include #endif #ifdef HAVE_NETINET_IN_H #include #endif #endif ] ) dnl Check if the getnameinfo function is available dnl and get the types of five of its arguments. CURL_CHECK_FUNC_GETNAMEINFO CURL_CHECK_NONBLOCKING_SOCKET AC_C_BIGENDIAN( [AC_DEFINE(ARES_BIG_ENDIAN, 1, [define this if ares is built for a big endian system])], , [AC_MSG_WARN([couldn't figure out endianess, assuming little endian!])] ) dnl Check for user-specified random device AC_ARG_WITH(random, AC_HELP_STRING([--with-random=FILE], [read randomness from FILE (default=/dev/urandom)]), [ RANDOM_FILE="$withval" ], [ dnl Check for random device. If we're cross compiling, we can't dnl check, and it's better to assume it doesn't exist than it is dnl to fail on AC_CHECK_FILE or later. if test "$cross_compiling" = "no"; then AC_CHECK_FILE("/dev/urandom", [ RANDOM_FILE="/dev/urandom"] ) else AC_MSG_WARN([cannot check for /dev/urandom while cross compiling; assuming none]) fi ] ) if test -n "$RANDOM_FILE" && test X"$RANDOM_FILE" != Xno ; then AC_SUBST(RANDOM_FILE) AC_DEFINE_UNQUOTED(RANDOM_FILE, "$RANDOM_FILE", [a suitable file/device to read random data from]) fi CARES_PRIVATE_LIBS="$LIBS" AC_SUBST(CARES_PRIVATE_LIBS) AC_CONFIG_FILES([Makefile libcares.pc]) AC_OUTPUT