6ecf49223089b374aae7821ee3a86a4a252ecca9
hiram
  Tue Oct 26 14:47:51 2010 -0700
add -lpng if libpng.a is not found
diff --git src/inc/common.mk src/inc/common.mk
index 65c9f3c..deaca0b 100644
--- src/inc/common.mk
+++ src/inc/common.mk
@@ -33,30 +33,35 @@
   ifneq ($(wildcard /usr/include/png.h),)
     USE_PNG=1
   endif
 endif
 
 ifeq (${PNGLIB},)
   ifneq ($(wildcard /usr/lib64/libpng.a),)
       PNGLIB=/usr/lib64/libpng.a
   endif
 endif
 ifeq (${PNGLIB},)
   ifneq ($(wildcard /usr/lib/libpng.a),)
       PNGLIB=/usr/lib/libpng.a
   endif
 endif
+ifeq (${PNGLIB},)
+  ifeq (${USE_PNG},1)
+      PNGLIB=-lpng
+  endif
+endif
 ifneq (${PNGLIB},)
   ifeq (${USE_PNG},)
     USE_PNG=1
   endif
 endif
 ifeq (${USE_PNG},)
   ifneq (${PNGLIB},)
     ifneq ($(wildcard ${PNGLIB}),)
       USE_PNG=1
     endif
   endif
 endif
 
 # libpng: disabled by default
 #  for dynamic linking PNGLIB=-lpng