commit cd04daa9777f613daa23b3dd6f8ae1f7bc270cf8
Author: orbea <orbea@riseup.net>
Date:   Wed Mar 31 06:58:01 2021 -0700

    build: Fix undefined references for libm.

diff --git a/configure.ac b/configure.ac
index 1cf7578..3e3ba4c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -21,6 +21,9 @@ disableval="y"
 
 AC_ARG_ENABLE(animation, 	[  --enable-animation		compile clearlooks with animation support], 	[animation=$disableval], 	[animation=$enableval])
 
+AC_CHECK_LIBM
+AC_SUBST([LIBM])
+
 PKG_CHECK_MODULES(GTK, gtk+-2.0 >= 2.8.0,,
                   AC_MSG_ERROR([GTK+-2.8 is required to compile gtk-engines]))
 
diff --git a/engine/Makefile.am b/engine/Makefile.am
index d98d0a0..d555e6e 100644
--- a/engine/Makefile.am
+++ b/engine/Makefile.am
@@ -22,5 +22,4 @@ libubuntulooks_la_SOURCES =		\
 	./src/config.h
 
 libubuntulooks_la_LDFLAGS = -module -avoid-version -no-undefined
-libubuntulooks_la_LIBADD =  $(GTK_LIBS)
-
+libubuntulooks_la_LIBADD = $(GTK_LIBS) $(LIBM)