gl: Move DRM_CFLAGS into gst-gl.m4

configure.ac

@@ -295,9 +295,6 @@ GST_PREFIX="`$PKG_CONFIG --variable=prefix gstreamer-$GST_API_VERSION`"
 AC_SUBST(GLIB_PREFIX)
 AC_SUBST(GST_PREFIX)
 
-dnl check for libdrm
-PKG_CHECK_MODULES(DRM, libdrm >= 2.4.55, HAVE_DRM=yes, HAVE_DRM=no)
-
 AG_GST_GL_CHECKS
 
 dnl check for gudev

gst-libs/gst/gl/Makefile.am

@@ -154,7 +154,6 @@ libgstgl_@GST_API_VERSION@_la_CFLAGS = \
 	$(GST_PLUGINS_BASE_CFLAGS) \
 	$(GST_BASE_CFLAGS) \
 	$(GST_CFLAGS) \
-	$(DRM_CFLAGS) \
 	$(GL_CFLAGS)
 
 libgstgl_@GST_API_VERSION@_la_LDFLAGS = \

m4/gst-gl.m4

@@ -172,10 +172,15 @@ case $host in
         AC_CHECK_LIB([EGL], [fbGetDisplay], [HAVE_VIV_FB_EGL=yes])
     fi
 
-    if test "x$HAVE_EGL" = "xyes" -a "x$HAVE_DRM" = "xyes"; then
-        PKG_CHECK_MODULES(GBM, gbm, HAVE_GBM_EGL=yes, HAVE_GBM_EGL=no)
-        AC_SUBST(GBM_CFLAGS)
-        AC_SUBST(GBM_LIBS)
+    if test "x$HAVE_EGL" = "xyes"; then
+        PKG_CHECK_MODULES(DRM, libdrm >= 2.4.55, HAVE_DRM=yes, HAVE_DRM=no)
+        AC_SUBST(DRM_CFLAGS)
+        AC_SUBST(DRM_LIBS)
+        if test "x$HAVE_DRM" = "xyes"; then
+          PKG_CHECK_MODULES(GBM, gbm, HAVE_GBM_EGL=yes, HAVE_GBM_EGL=no)
+          AC_SUBST(GBM_CFLAGS)
+          AC_SUBST(GBM_LIBS)
+       fi
     fi
 
     dnl FIXME: Mali EGL depends on GLESv1 or GLESv2
@@ -479,8 +484,7 @@ case $host in
         AC_MSG_WARN([EGL is required by the Mesa GBM EGL backend])
       else
         HAVE_WINDOW_GBM=yes
-        GL_LIBS="$GL_LIBS"
-        GL_CFLAGS="$GL_CFLAGS"
+        GL_CFLAGS="$GL_CFLAGS DRM_CFLAGS"
       fi
     fi