https://bugs.gentoo.org/779127

commit 7f1fc516fbfb185e77b0acaab84a25b666a55e21
Author: orbea <orbea@riseup.net>
Date:   Mon Mar 29 11:50:45 2021 -0700

    build: Fix undefined libm reference.

diff --git a/configure.in b/configure.in
index bd01480..63eb587 100644
--- a/configure.in
+++ b/configure.in
@@ -23,6 +23,9 @@ GNOME_COMPILE_WARNINGS(error)
 DEPRECATED_FLAGS="-DG_DISABLE_DEPRECATED -DGDK_DISABLE_DEPRECATED -DGDK_PIXBUF_DISABLE_DEPRECATED -DGTK_DISABLE_DEPRECATED"
 AC_SUBST(DEPRECATED_FLAGS)
 
+AC_CHECK_LIBM
+AC_SUBST([LIBM])
+
 PKG_CHECK_MODULES(DEP,
     gtk+-2.0 >= 2.6.0)
 AC_SUBST(DEP_CFLAGS)
diff --git a/src/Makefile.am b/src/Makefile.am
index 57c9f42..375dc44 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -41,7 +41,7 @@ libgtkimageview_la_SOURCES =        \
 	$(BUILT_SOURCES)	    \
 	$(libgtkimageview_headers)
 
-libgtkimageview_la_LIBADD = $(DEP_LIBS)
+libgtkimageview_la_LIBADD = $(DEP_LIBS) $(LIBM)
 libgtkimageview_la_LDFLAGS = -no-undefined
 
 libgtkimageview_includedir = $(includedir)/gtkimageview