[PATCH 1/4] drm: Add config for detecting libdrm

[Patrik Jakobsson]

Use pkg-config to try to find libdrm headers. If that fails look for
the kernel headers. If no headers are found, drm support will not be
compiled.

* configure.ac: Use pkg-config to find libdrm

Signed-off-by: Patrik Jakobsson <pjakobsson at suse.de>
---
 configure.ac | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/configure.ac b/configure.ac
index 9bf64c33..fefd3104 100644
--- a/configure.ac
+++ b/configure.ac
@@ -887,6 +887,11 @@ AC_CHECK_TOOL([READELF], [readelf])
 
 st_STACKTRACE
 
+PKG_CHECK_MODULES([LIBDRM], [libdrm],
+		  [CPPFLAGS="$CPPFLAGS $LIBDRM_CFLAGS"
+		   AC_CHECK_HEADERS([drm.h i915_drm.h])],
+		  [AC_CHECK_HEADERS([drm/drm.h drm/i915_drm.h])])
+
 if test "$arch" = mips && test "$no_create" != yes; then
 	mkdir -p linux/mips
 	if $srcdir/linux/mips/genstub.sh linux/mips; then
-- 
2.21.0