mkvtoolnix/ac/curl.m4

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dnl
dnl Check for libcurl
dnl
continue_curl_check=1
AC_ARG_WITH(curl_config,
AC_HELP_STRING([--with-curl-config=prog],[use prog instead of looking for curl-config]),
[ CURL_CONFIG="$with_curl_config" ],)
AC_PATH_PROG(CURL_CONFIG, curl-config, no, $PATH:/usr/local/bin)
if test x"$CURL_CONFIG" = "xno" ; then
echo "*** Not checking for curl: curl-config not found"
continue_curl_check=0
elif test ! -x "$CURL_CONFIG" ; then
echo "*** Not checking for curl: file '"$CURL_CONFIG"' not executable"
continue_curl_check=0
fi
if test x"$continue_curl_check" = x1 ; then
CURL_CFLAGS=`$CURL_CONFIG --cflags`
CURL_LIBS=`$CURL_CONFIG --libs`
ac_save_CXXFLAGS="$CXXFLAGS"
ac_save_LIBS="$LIBS"
CXXFLAGS="$CXXFLAGS $CURL_CFLAGS"
LIBS="$LIBS $CURL_LIBS"
AC_CHECK_LIB(curl, curl_easy_init,
[ curl_found=yes ],
[ curl_found=no ],)
if test "$curl_found" = "yes"; then
AC_CHECK_HEADERS(curl/easy.h, , curl_found=no, [#include <curl/curl.h>])
fi
CXXFLAGS="$ac_save_CXXFLAGS"
LIBS="$ac_save_LIBS"
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fi
if test "$curl_found" = "yes"; then
opt_features_yes="$opt_features_yes\n * online update checks (via libcurl)"
else
opt_features_no="$opt_features_no\n * online update checks (via libcurl)"
CURL_CFLAGS=""
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CURL_LIBS=""
fi
AC_SUBST(CURL_CFLAGS)
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AC_SUBST(CURL_LIBS)