--- liquidwar-5.6.5/src/Makefile.in	2018-12-23 11:04:36.000000000 -0800
+++ liquidwar-5.6.5b/src/Makefile.in	2020-09-20 00:55:31.053774726 -0700
@@ -233,7 +233,7 @@
     EXTERN_LIBS = `allegro-config --static $(ALLEGRO_LIBRARY)` $(EFENCE_LIBRARY)
 else
     LINK_OPTIONS =
-    EXTERN_LIBS = `allegro-config --libs $(ALLEGRO_LIBRARY)` $(EFENCE_LIBRARY)
+    EXTERN_LIBS = `allegro-config --libs $(ALLEGRO_LIBRARY)` $(EFENCE_LIBRARY) -lm
 endif
 
 CONFIG_OPTIONS = \