Add PKG_CONFIG config variable

git-svn-id: http://svn.code.sf.net/p/netpbm/code/trunk@2840 9d0c8265-081b-0410-96cb-a4ca84ce46f8

3 files changed, 17 insertions, 11 deletions

diff --git a/config.mk.in b/config.mk.in
index b63831aa..ee692332 100644
--- a/config.mk.in
+++ b/config.mk.in
@@ -161,6 +161,12 @@ LEX = flex
 # 
 # LEX = lex
 
+# PKG_CONFIG is the beginning of a shell command that tells things about how
+# some package (e.g. the PNG library) is installed on the build system.  For
+# example, it can tell what link options you need to link the PNG library to a
+# program.
+PKG_CONFIG = pkg-config
+
 # C compiler options 
 
 # gcc:
diff --git a/converter/other/Makefile b/converter/other/Makefile
index 6a3d14ed..b01f66ae 100644
--- a/converter/other/Makefile
+++ b/converter/other/Makefile
@@ -7,12 +7,12 @@ VPATH=.:$(SRCDIR)/$(SUBDIR)
 
 include $(BUILDDIR)/config.mk
 
-TEST_PKGCONFIG_LIBXML2 = if pkg-config libxml-2.0; then echo exists; fi
+TEST_PKGCONFIG_LIBXML2 = if $(PKG_CONFIG) libxml-2.0; then echo exists; fi
 
 ifneq ($(shell $(TEST_PKGCONFIG_LIBXML2)),)
   # pkg-config libxml2 works on this system
-  XML2_LIBS = $(shell pkg-config libxml-2.0 --libs)
-  XML2_CFLAGS = $(shell pkg-config libxml-2.0 --cflags)
+  XML2_LIBS = $(shell $(PKG_CONFIG) libxml-2.0 --libs)
+  XML2_CFLAGS = $(shell $(PKG_CONFIG) libxml-2.0 --cflags)
 else
   ifeq ($(shell xml2-config --version),)
     XML2_LIBS=NONE
@@ -34,12 +34,12 @@ ifneq ($(TIFFLIB),NONE)
   endif
 endif
 
-TEST_PKGCONFIG_LIBPNG = if pkg-config libpng$(PNGVER); then echo exists; fi
+TEST_PKGCONFIG_LIBPNG = if $(PKG_CONFIG) libpng$(PNGVER); then echo exists; fi
 
 ifneq ($(shell $(TEST_PKGCONFIG_LIBPNG)),)
   # pkg-config libpng works on this system
   HAVE_PNGLIB = Y
-  EXTERN_INCLUDES += $(shell pkg-config libpng$(PNGVER) --cflags)
+  EXTERN_INCLUDES += $(shell $(PKG_CONFIG) libpng$(PNGVER) --cflags)
 else
   ifneq ($(shell libpng$(PNGVER)-config --version),)
     # No pkg-config, but we have libpng-config on this system
@@ -192,7 +192,7 @@ tifftopnm pamtotiff pnmtotiffcmyk: \
 
 ifneq ($(shell $(TEST_PKGCONFIG_LIBPNG)),)
   # pkg-config libpng works on this system
-  PNGLIB_LIBOPTS = $(shell pkg-config libpng$(PNGVER) --libs)
+  PNGLIB_LIBOPTS = $(shell $(PKG_CONFIG) libpng$(PNGVER) --libs)
 else
   ifneq ($(shell libpng$(PNGVER)-config --version),)
     # No pkg-config, but we have libpng-config on this system
diff --git a/other/pamx/Makefile b/other/pamx/Makefile
index 4e06e0fd..e4892540 100644
--- a/other/pamx/Makefile
+++ b/other/pamx/Makefile
@@ -9,7 +9,7 @@ include $(BUILDDIR)/config.mk
 
 EXTERN_INCLUDE =
 
-ifeq ($(shell pkg-config x11 --modversion --silence-errors),)
+ifeq ($(shell $(PKG_CONFIG) x11 --modversion --silence-errors),)
   # Pkg-config has never heard of X11, or doesn't even exist
 
   ifneq ($(X11LIB),NONE)
@@ -20,8 +20,8 @@ ifeq ($(shell pkg-config x11 --modversion --silence-errors),)
   endif
 else
   HAVE_X11LIB = Y
-  X11LIB = $(shell pkg-config x11 --libs)
-  EXTERN_INCLUDES += $(shell pkg-config x11 --cflags)
+  X11LIB = $(shell $(PKG_CONFIG) x11 --libs)
+  EXTERN_INCLUDES += $(shell $(PKG_CONFIG) x11 --cflags)
 endif
 
 ifeq ($(HAVE_X11LIB),Y)
@@ -46,10 +46,10 @@ all: $(BINARIES)
 
 include $(SRCDIR)/common.mk
 
-ifeq ($(shell pkg-config x11 --libs),)
+ifeq ($(shell $(PKG_CONFIG) x11 --libs),)
   X11_LIBOPTS = $(shell $(LIBOPT) $(LIBOPTR) $(X11LIB))
 else
-  X11_LIBOPTS = $(shell pkg-config x11 --libs)
+  X11_LIBOPTS = $(shell $(PKG_CONFIG) x11 --libs)
 endif
 
 pamx: image.o send.o window.o