Exit with error message if pkg-config is not found
PKG_PROG_PKG_CONFIG does not exit if it fails to find pkg-config.
Continuing without pkg-config leads to misleading error messages when
checks for packages fail.
@@ -8,7 +8,11 @@ AC_CONFIG_MACRO_DIR([m4])
AC_PROG_CC
AC_C_CONST
AC_PROG_LIBTOOL
+
PKG_PROG_PKG_CONFIG
+if test "x$PKG_CONFIG" = "x"; then
+ AC_MSG_ERROR([please install pkg-config])
+fi
AC_CONFIG_SUBDIRS([libpainter librfxcodec])
