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# Check if a given expression will compile using a certain header.
# AST_C_COMPILE_CHECK([package], [expression], [header file], [version], [description])
AC_DEFUN([AST_C_COMPILE_CHECK],
[
if test "x${PBX_$1}" != "x1" -a "${USE_$1}" != "no"; then
AC_MSG_CHECKING(m4_ifval([$5],[for $5],[if "$2" compiles using $3]))
saved_cppflags="${CPPFLAGS}"
if test "x${$1_DIR}" != "x"; then
$1_INCLUDE="-I${$1_DIR}/include"
fi
CPPFLAGS="${CPPFLAGS} ${$1_INCLUDE}"
AC_COMPILE_IFELSE(
[ AC_LANG_PROGRAM( [#include <$3>],
[ $2; ]
)],
[ AC_MSG_RESULT(yes)
PBX_$1=1
AC_DEFINE([HAVE_$1], 1, [Define if your system has the $1 headers.])
m4_ifval([$4], [AC_DEFINE([HAVE_$1_VERSION], $4, [Define $1 headers version])])
],
[ AC_MSG_RESULT(no) ]
)
CPPFLAGS="${saved_cppflags}"
fi
])
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