diff --git a/GWW/gww/Makefile b/GWW/gww/Makefile
index e4c4dd5bb5..f49f7a30d5 100644
--- a/GWW/gww/Makefile
+++ b/GWW/gww/Makefile
@@ -4,7 +4,7 @@
 include ../../make.inc
 
 # location of include files
-IFLAGS=
+IFLAGS+=
 
 # location of needed modules
 MODFLAGS= $(BASEMOD_FLAGS) \
diff --git a/GWW/simple/Makefile b/GWW/simple/Makefile
index 629ce7d9d0..835408efd2 100644
--- a/GWW/simple/Makefile
+++ b/GWW/simple/Makefile
@@ -1,9 +1,9 @@
 # Makefile for  simple
 
 include ../../make.inc
-
+LIBMIN = ../minpack/minpacklib.a
 # location of include files
-IFLAGS=-I../../../include
+IFLAGS+=-I../../../include
 
 # location of needed modules
 MODFLAGS= $(BASEMOD_FLAGS) \