diff --git a/glslang.changes b/glslang.changes
index 670cc4d..5ed384b 100644
--- a/glslang.changes
+++ b/glslang.changes
@@ -1,3 +1,8 @@
+-------------------------------------------------------------------
+Mon Feb  3 10:09:18 UTC 2020 - Antonio Larrosa <alarrosa@suse.com>
+
+- Fix build when _lto_cflags is not defined (as in SLE/Leap)
+
 -------------------------------------------------------------------
 Sun Jan 19 11:38:09 UTC 2020 - Jan Engelhardt <jengelh@inai.de>
 
diff --git a/glslang.spec b/glslang.spec
index b3710a2..5848704 100644
--- a/glslang.spec
+++ b/glslang.spec
@@ -74,7 +74,7 @@ compressor's dictionary can find better cross module commonality.
 %autosetup -p1
 
 %build
-%global _lto_cflags %{_lto_cflags} -ffat-lto-objects
+%global _lto_cflags %{?_lto_cflags} -ffat-lto-objects
 # Trim -Wl,--no-undefined for now (https://github.com/KhronosGroup/glslang/issues/1484)
 %cmake -DCMAKE_SHARED_LINKER_FLAGS="-Wl,--as-needed -Wl,-z,now"
 make %{?_smp_mflags}