diff --git a/giac-config.patch b/giac-config.patch
new file mode 100644
index 0000000..c7c4658
--- /dev/null
+++ b/giac-config.patch
@@ -0,0 +1,19 @@
+diff --git a/m4/intdiv0.m4 b/m4/intdiv0.m4
+index b8d7817..23fdc1d 100644
+--- m4/intdiv0.m4
++++ m4/intdiv0.m4
+@@ -29,10 +29,10 @@ sigfpe_handler (sig) int sig;
+   exit (sig != SIGFPE);
+ }
+ 
+-int x = 1;
+-int y = 0;
+-int z;
+-int nan;
++volatile int x = 1;
++volatile int y = 0;
++volatile int z;
++volatile int nan;
+ 
+ int main ()
+ {
diff --git a/giac.spec b/giac.spec
index 8122691..000890c 100644
--- a/giac.spec
+++ b/giac.spec
@@ -7,7 +7,7 @@
 Name:          giac
 Summary:       Computer Algebra System, Symbolic calculus, Geometry
 Version:       1.5.0%{subversion}
-Release:       3%{?dist}
+Release:       4%{?dist}
 # LGPLv3+: src/Fl_GDI_Printer.cxx, src/Flv_List.cc, src/Flv_Table.cc
 # BSD: src/tinymt32*
 License:       GPLv3+
@@ -25,6 +25,9 @@ Patch0:        %{name}-iszero.patch
 # Adapt to cocoalib 0.99700
 Patch1:        %{name}-cocoalib.patch
 
+# Deal with LTO compromised configure test
+Patch2:        %{name}-config.patch
+
 BuildRequires: readline-devel
 BuildRequires: gettext-devel
 BuildRequires: gcc-c++
@@ -387,6 +390,9 @@ make -C check check
 %{_datadir}/giac/examples/
 
 %changelog
+* Tue Jun 30 2020 Jeff Law <law@redhat.com> - 1.5.0.85-4
+- Fix broken configure test compromised by LTO
+
 * Tue Jun  2 2020 Jerry James <loganjerry@gmail.com> - 1.5.0.85-3
 - Rebuild for nauty 2.7.1