Readd glib checks which are needed to build on linux. Then force the dependency on pkg-config because without it we don't have glib which is mandatory.

desmume/configure.ac

@@ -88,17 +88,17 @@ if test "x$osmesa" = "xyes" ; then
 fi
 
 dnl - Check for GTK and/or libglade
-FOUND_GLIB=yes
+FOUND_GLIB=no
 HAVE_ALSA=no
 GLIB_VER=2.8
 GTK_VER=2.6
 AC_CHECK_TOOL(HAVE_PKG, pkg-config)
 AC_PROVIDE_IFELSE([PKG_PROG_PKG_CONFIG], [
   if test ! "x$HAVE_PKG" = "x" ; then
-    #PKG_CHECK_MODULES(GLIB,
-    #                  glib-2.0 >= $GLIB_VER,
-    #                  FOUND_GLIB=yes,
-    #                  FOUND_GLIB=no)
+    PKG_CHECK_MODULES(GLIB,
+                      glib-2.0 >= $GLIB_VER,
+                      FOUND_GLIB=yes,
+                      FOUND_GLIB=no)
 
     PKG_CHECK_MODULES(GTK,
                       gtk+-2.0 >= $GTK_VER,
@@ -155,7 +155,7 @@ AC_PROVIDE_IFELSE([PKG_PROG_PKG_CONFIG], [
     AC_PATH_PROG(UPDATEDESKTOP, [update-desktop-database])
   fi
 ],[
-    echo "WARNING: pkg-config is not available therefore gtk, gtk-glade UIs and lua scripting are not available either."
+    AC_MSG_ERROR([pkg-config is required to build desmume])
 ])
 
 dnl -- force lua disabled