https://sourceforge.net/p/gtkdatabox/git/merge-requests/5/
https://sourceforge.net/p/gtkdatabox/git/ci/88d2bd66571e083e3beaf0ea6004c1b739a20713/

From 88d2bd66571e083e3beaf0ea6004c1b739a20713 Mon Sep 17 00:00:00 2001
From: orbea <orbea@riseup.net>
Date: Thu, 7 Mar 2024 14:29:18 -0800
Subject: [PATCH] gtk: add missing libm depedency

When building with slibtool it fails with undefined references for libm,
with GNU libtool it doesn't fails because -no-undefined gets silently
ignored while slibtool correctly passes -Wl,--no-undefined to the
linker.

Gentoo issue: https://bugs.gentoo.org/913728
---
 configure.ac    | 2 ++
 gtk/Makefile.am | 5 ++++-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index 78b8caa..ac95247 100644
--- a/configure.ac
+++ b/configure.ac
@@ -40,6 +40,8 @@ AC_PROG_CC_C99
 AC_PROG_CPP
 AC_PROG_INSTALL
 
+LT_LIB_M
+
 m4_define([gtk_required_version], [3.4.0])
 m4_define([pango_required_version], [1.29.0])
 m4_define([cairo_required_version], [1.10.0])
diff --git a/gtk/Makefile.am b/gtk/Makefile.am
index 4a816fb..7d399de 100644
--- a/gtk/Makefile.am
+++ b/gtk/Makefile.am
@@ -20,7 +20,10 @@ libgtkdatabox_la_SOURCES= \
 
 libgtkdatabox_la_LDFLAGS= \
 		        -version-info $(DATABOX_LT_VERSION)\
-			-no-undefined \
+			-no-undefined
+
+libgtkdatabox_la_LIBADD= \
+			@LIBM@ \
 			@GTK_LIBS@