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# LIBCURL_CHECK_CONFIG ([DEFAULT-ACTION], [MINIMUM-VERSION],
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# [ACTION-IF-YES], [ACTION-IF-NO])
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# ----------------------------------------------------------
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# David Shaw <dshaw@jabberwocky.com> May-09-2006
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# Checks for libcurl. DEFAULT-ACTION is the string yes or no to
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# specify whether to default to --with-libcurl or --without-libcurl.
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# If not supplied, DEFAULT-ACTION is yes. MINIMUM-VERSION is the
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# minimum version of libcurl to accept. Pass the version as a regular
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# version number like 7.10.1. If not supplied, any version is
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# accepted. ACTION-IF-YES is a list of shell commands to run if
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# libcurl was successfully found and passed the various tests.
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# ACTION-IF-NO is a list of shell commands that are run otherwise.
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# Note that using --without-libcurl does run ACTION-IF-NO.
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# This macro #defines HAVE_LIBCURL if a working libcurl setup is
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# found, and sets @LIBCURL@ and @LIBCURL_CPPFLAGS@ to the necessary
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# values. Other useful defines are LIBCURL_FEATURE_xxx where xxx are
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# the various features supported by libcurl, and LIBCURL_PROTOCOL_yyy
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# where yyy are the various protocols supported by libcurl. Both xxx
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# and yyy are capitalized. See the list of AH_TEMPLATEs at the top of
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# the macro for the complete list of possible defines. Shell
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# variables $libcurl_feature_xxx and $libcurl_protocol_yyy are also
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# defined to 'yes' for those features and protocols that were found.
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# Note that xxx and yyy keep the same capitalization as in the
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# curl-config list (e.g. it's "HTTP" and not "http").
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# Users may override the detected values by doing something like:
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# LIBCURL="-lcurl" LIBCURL_CPPFLAGS="-I/usr/myinclude" ./configure
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# For the sake of sanity, this macro assumes that any libcurl that is
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# found is after version 7.7.2, the first version that included the
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# curl-config script. Note that it is very important for people
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# packaging binary versions of libcurl to include this script!
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# Without curl-config, we can only guess what protocols are available,
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# or use curl_version_info to figure it out at runtime.
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AC_DEFUN([LIBCURL_CHECK_CONFIG],
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AH_TEMPLATE([LIBCURL_FEATURE_SSL],[Defined if libcurl supports SSL])
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AH_TEMPLATE([LIBCURL_FEATURE_KRB4],[Defined if libcurl supports KRB4])
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AH_TEMPLATE([LIBCURL_FEATURE_IPV6],[Defined if libcurl supports IPv6])
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AH_TEMPLATE([LIBCURL_FEATURE_LIBZ],[Defined if libcurl supports libz])
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AH_TEMPLATE([LIBCURL_FEATURE_ASYNCHDNS],[Defined if libcurl supports AsynchDNS])
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AH_TEMPLATE([LIBCURL_FEATURE_IDN],[Defined if libcurl supports IDN])
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AH_TEMPLATE([LIBCURL_FEATURE_SSPI],[Defined if libcurl supports SSPI])
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AH_TEMPLATE([LIBCURL_FEATURE_NTLM],[Defined if libcurl supports NTLM])
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AH_TEMPLATE([LIBCURL_PROTOCOL_HTTP],[Defined if libcurl supports HTTP])
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AH_TEMPLATE([LIBCURL_PROTOCOL_HTTPS],[Defined if libcurl supports HTTPS])
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AH_TEMPLATE([LIBCURL_PROTOCOL_FTP],[Defined if libcurl supports FTP])
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AH_TEMPLATE([LIBCURL_PROTOCOL_FTPS],[Defined if libcurl supports FTPS])
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AH_TEMPLATE([LIBCURL_PROTOCOL_FILE],[Defined if libcurl supports FILE])
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AH_TEMPLATE([LIBCURL_PROTOCOL_TELNET],[Defined if libcurl supports TELNET])
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AH_TEMPLATE([LIBCURL_PROTOCOL_LDAP],[Defined if libcurl supports LDAP])
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AH_TEMPLATE([LIBCURL_PROTOCOL_DICT],[Defined if libcurl supports DICT])
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AH_TEMPLATE([LIBCURL_PROTOCOL_TFTP],[Defined if libcurl supports TFTP])
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AC_HELP_STRING([--with-libcurl=DIR],[look for the curl library in DIR]),
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[_libcurl_with=$withval],[_libcurl_with=ifelse([$1],,[yes],[$1])])
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if test "$_libcurl_with" != "no" ; then
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_libcurl_version_parse="eval $AWK '{split(\$NF,A,\".\"); X=256*256*A[[1]]+256*A[[2]]+A[[3]]; print X;}'"
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if test -d "$_libcurl_with" ; then
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LIBCURL_CPPFLAGS="-I$withval/include"
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_libcurl_ldflags="-L$withval/lib"
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AC_PATH_PROG([_libcurl_config],["$withval/bin/curl-config"])
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AC_PATH_PROG([_libcurl_config],[curl-config])
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if test x$_libcurl_config != "x" ; then
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AC_CACHE_CHECK([for the version of libcurl],
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[libcurl_cv_lib_curl_version],
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[libcurl_cv_lib_curl_version=`$_libcurl_config --version | $AWK '{print $[]2}'`])
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_libcurl_version=`echo $libcurl_cv_lib_curl_version | $_libcurl_version_parse`
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_libcurl_wanted=`echo ifelse([$2],,[0],[$2]) | $_libcurl_version_parse`
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if test $_libcurl_wanted -gt 0 ; then
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AC_CACHE_CHECK([for libcurl >= version $2],
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[libcurl_cv_lib_version_ok],
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if test $_libcurl_version -ge $_libcurl_wanted ; then
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libcurl_cv_lib_version_ok=yes
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libcurl_cv_lib_version_ok=no
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if test $_libcurl_wanted -eq 0 || test x$libcurl_cv_lib_version_ok = xyes ; then
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if test x"$LIBCURL_CPPFLAGS" = "x" ; then
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LIBCURL_CPPFLAGS=`$_libcurl_config --cflags`
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if test x"$LIBCURL" = "x" ; then
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LIBCURL=`$_libcurl_config --libs`
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# This is so silly, but Apple actually has a bug in their
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# curl-config script. Fixed in Tiger, but there are still
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# lots of Panther installs around.
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powerpc-apple-darwin7*)
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LIBCURL=`echo $LIBCURL | sed -e 's|-arch i386||g'`
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# All curl-config scripts support --feature
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_libcurl_features=`$_libcurl_config --feature`
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# Is it modern enough to have --protocols? (7.12.4)
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if test $_libcurl_version -ge 461828 ; then
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_libcurl_protocols=`$_libcurl_config --protocols`
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unset _libcurl_wanted
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if test $_libcurl_try_link = yes ; then
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# we didn't find curl-config, so let's see if the user-supplied
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# link line (or failing that, "-lcurl") is enough.
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LIBCURL=${LIBCURL-"$_libcurl_ldflags -lcurl"}
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AC_CACHE_CHECK([whether libcurl is usable],
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[libcurl_cv_lib_curl_usable],
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_libcurl_save_cppflags=$CPPFLAGS
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CPPFLAGS="$LIBCURL_CPPFLAGS $CPPFLAGS"
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_libcurl_save_libs=$LIBS
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LIBS="$LIBCURL $LIBS"
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AC_LINK_IFELSE(AC_LANG_PROGRAM([#include <curl/curl.h>],[
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/* Try and use a few common options to force a failure if we are
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missing symbols or can't link. */
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curl_easy_setopt(NULL,CURLOPT_URL,NULL);
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x=CURLOPT_WRITEFUNCTION;
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x=CURLOPT_ERRORBUFFER;
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]),libcurl_cv_lib_curl_usable=yes,libcurl_cv_lib_curl_usable=no)
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CPPFLAGS=$_libcurl_save_cppflags
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LIBS=$_libcurl_save_libs
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unset _libcurl_save_cppflags
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unset _libcurl_save_libs
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if test $libcurl_cv_lib_curl_usable = yes ; then
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# Does curl_free() exist in this version of libcurl?
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# If not, fake it with free()
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_libcurl_save_cppflags=$CPPFLAGS
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CPPFLAGS="$CPPFLAGS $LIBCURL_CPPFLAGS"
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_libcurl_save_libs=$LIBS
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LIBS="$LIBS $LIBCURL"
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AC_CHECK_FUNC(curl_free,,
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AC_DEFINE(curl_free,free,
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[Define curl_free() as free() if our version of curl lacks curl_free.]))
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CPPFLAGS=$_libcurl_save_cppflags
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LIBS=$_libcurl_save_libs
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unset _libcurl_save_cppflags
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unset _libcurl_save_libs
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AC_DEFINE(HAVE_LIBCURL,1,
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[Define to 1 if you have a functional curl library.])
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AC_SUBST(LIBCURL_CPPFLAGS)
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for _libcurl_feature in $_libcurl_features ; do
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AC_DEFINE_UNQUOTED(AS_TR_CPP(libcurl_feature_$_libcurl_feature),[1])
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eval AS_TR_SH(libcurl_feature_$_libcurl_feature)=yes
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if test "x$_libcurl_protocols" = "x" ; then
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# We don't have --protocols, so just assume that all
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# protocols are available
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_libcurl_protocols="HTTP FTP FILE TELNET LDAP DICT"
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if test x$libcurl_feature_SSL = xyes ; then
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_libcurl_protocols="$_libcurl_protocols HTTPS"
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# FTPS wasn't standards-compliant until version
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if test $_libcurl_version -ge 461568; then
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_libcurl_protocols="$_libcurl_protocols FTPS"
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for _libcurl_protocol in $_libcurl_protocols ; do
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AC_DEFINE_UNQUOTED(AS_TR_CPP(libcurl_protocol_$_libcurl_protocol),[1])
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eval AS_TR_SH(libcurl_protocol_$_libcurl_protocol)=yes
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unset LIBCURL_CPPFLAGS
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unset _libcurl_try_link
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unset _libcurl_version_parse
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unset _libcurl_config
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unset _libcurl_feature
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unset _libcurl_features
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unset _libcurl_protocol
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unset _libcurl_protocols
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unset _libcurl_version
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unset _libcurl_ldflags
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if test x$_libcurl_with = xno || test x$libcurl_cv_lib_curl_usable != xyes ; then
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# This is the IF-NO path
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# This is the IF-YES path
added
removed
m4/libcurl.m4
