--- ogdi-4.0.0/ogdi/driver/adrg/makefile.orig	2019-03-07 16:14:37.864950557 +0100
+++ ogdi-4.0.0/ogdi/driver/adrg/makefile	2019-03-07 16:14:47.782633300 +0100
@@ -20,7 +20,7 @@
 
 CFLAGS 	= $(INCLUDES) $(COMMON_CFLAGS)
 
-LINK_LIBS= $(OGDI_LINKLIB) $(GLUTIL_STATICLIB) 
+LINK_LIBS= $(OGDI_LINKLIB) $(GLUTIL_STATICLIB) -lm
 
 include $(TOPDIR)/config/common.mak