diff --git a/sys-cluster/usort/files/usort-0_pre20211230-fix-fpermissive.patch b/sys-cluster/usort/files/usort-0_pre20211230-fix-fpermissive.patch
new file mode 100644
index 0000000000..d99d4117ef
--- /dev/null
+++ b/sys-cluster/usort/files/usort-0_pre20211230-fix-fpermissive.patch
@@ -0,0 +1,10 @@
+--- a/include/ompUtils.tcc
++++ b/include/ompUtils.tcc
+@@ -4,6 +4,7 @@
+ #include <vector>
+ #include <algorithm>
+ // #include <seqUtils.h>
++#include <cstring>
+ 
+ 
+ 
diff --git a/sys-cluster/usort/usort-0_pre20211230.ebuild b/sys-cluster/usort/usort-0_pre20211230.ebuild
index 503dbcb304..31b9b5e796 100644
--- a/sys-cluster/usort/usort-0_pre20211230.ebuild
+++ b/sys-cluster/usort/usort-0_pre20211230.ebuild
@@ -24,6 +24,7 @@ BDEPEND="app-text/dos2unix"
 PATCHES=(
 	"${FILESDIR}/${P}-cmake.patch"
 	"${FILESDIR}/${P}-rename-THRESHOLD.patch"
+	"${FILESDIR}/${P}-fix-fpermissive.patch"
 )
 
 src_prepare() {