v.external: fix Makefile

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@54827 15284696-431f-4ddb-bdfa-cd5b030d7da7

vector/v.external/Makefile

@@ -5,7 +5,7 @@ PGM=v.external
 LIBES = $(VECTORLIB) $(GISLIB) $(DBMIBASELIB) $(GPROJLIB) $(GDALLIBS) $(PQLIBPATH) $(PQLIB)
 DEPENDENCIES = $(VECTORDEP) $(GISDEP) $(DBMIBASEDEP) $(GPROJDEP) 
 
-EXTRA_INC = $(VECT_INC)
+EXTRA_INC = $(VECT_INC) $(PROJINC)
 EXTRA_CFLAGS = $(VECT_CFLAGS)
 EXTRA_LDFLAGS = $(PQLIBPATH)