DRI-specific pkg-config file

Since the gl pkg-config file doesn't convey any specifics about the
backend in use, this adds a new pkg-config file for when DRI is in use.
This can be used by the xserver build to determine if the DRI and/or
GLX extensions are appropriate.

Makefile

@@ -317,6 +317,7 @@ DRI_FILES = \
 	$(DIRECTORY)/src/glx/x11/*.[ch]					\
 	$(DIRECTORY)/src/mesa/drivers/dri/Makefile			\
 	$(DIRECTORY)/src/mesa/drivers/dri/Makefile.template		\
+	$(DIRECTORY)/src/mesa/drivers/dri/dri.pc.in			\
 	$(DIRECTORY)/src/mesa/drivers/dri/common/xmlpool/*.[ch]		\
 	$(DIRECTORY)/src/mesa/drivers/dri/common/xmlpool/*.po		\
 	$(DIRECTORY)/src/mesa/drivers/dri/*/*.[chS]			\

src/mesa/drivers/dri/Makefile

@@ -20,8 +20,17 @@ subdirs:
 		fi \
 	done
 
+pcedit = sed \
+	-e 's,@INSTALL_DIR@,$(INSTALL_DIR),' \
+	-e 's,@LIB_DIR@,$(LIB_DIR),' \
+	-e 's,@VERSION@,$(MESA_MAJOR).$(MESA_MINOR).$(MESA_TINY),' \
+	-e 's,@DRI_DRIVER_DIR@,$(DRI_DRIVER_SEARCH_DIR),'
 
-install:
+dri.pc: dri.pc.in
+	$(pcedit) $< > $@
+
+
+install: dri.pc
 	@for dir in $(DRI_DIRS) ; do \
 		if [ -d $$dir ] ; then \
 			(cd $$dir && $(MAKE) install) || exit 1 ; \
@@ -30,6 +39,8 @@ install:
 	$(INSTALL) -d $(DESTDIR)$(INSTALL_DIR)/include/GL/internal
 	$(INSTALL) -m 0644 $(TOP)/include/GL/internal/dri_interface.h $(DESTDIR)$(INSTALL_DIR)/include/GL/internal
 	$(INSTALL) -m 0644 $(TOP)/include/GL/internal/dri_sarea.h $(DESTDIR)$(INSTALL_DIR)/include/GL/internal
+	$(INSTALL) -d $(DESTDIR)$(INSTALL_DIR)/$(LIB_DIR)/pkgconfig
+	$(INSTALL) -m 0644 dri.pc $(DESTDIR)$(INSTALL_DIR)/$(LIB_DIR)/pkgconfig
 
 
 clean:

src/mesa/drivers/dri/dri.pc.in

@@ -0,0 +1,10 @@
+prefix=@INSTALL_DIR@
+exec_prefix=${prefix}
+libdir=${exec_prefix}/@LIB_DIR@
+includedir=${prefix}/include
+dridriverdir=@DRI_DRIVER_DIR@
+
+Name: dri
+Description: Direct Rendering Infrastructure
+Version: @VERSION@
+Cflags: -I${includedir}