diff --git a/pkgs/development/libraries/glibc-2.12/strncasecmp_sse42.patch b/pkgs/development/libraries/glibc-2.12/strncasecmp_sse42.patch
new file mode 100644
index 000000000000..e5e4613d9d1c
--- /dev/null
+++ b/pkgs/development/libraries/glibc-2.12/strncasecmp_sse42.patch
@@ -0,0 +1,31 @@
+https://bugzilla.redhat.com/show_bug.cgi?id=651638
+
+2010-11-09  H.J. Lu  <hongjiu.lu@intel.com>
+
+	[BZ #12205]
+	* string/test-strncasecmp.c (check_result): New function.
+	(do_one_test): Use it.
+	(check1): New function.
+	(test_main): Use it.
+
+	* sysdeps/i386/i686/multiarch/strcmp.S (nibble_ashr_use_sse4_2_exit):
+	Support strcasecmp and strncasecmp.
+
+diff --git a/sysdeps/x86_64/multiarch/strcmp.S b/sysdeps/x86_64/multiarch/strcmp.S
+index 54e5bbc..1859289 100644
+--- a/sysdeps/x86_64/multiarch/strcmp.S
++++ b/sysdeps/x86_64/multiarch/strcmp.S
+@@ -1809,7 +1809,13 @@ LABEL(nibble_ashr_15_use_sse4_2):
+ 	ja	LABEL(loop_ashr_15_use_sse4_2)
+ 
+ LABEL(nibble_ashr_use_sse4_2_exit):
++# if !defined USE_AS_STRCASECMP_L && !defined USE_AS_STRNCASECMP_L
+ 	pcmpistri      $0x1a,(%rsi,%rdx), %xmm0
++# else
++	movdqa	(%rsi,%rdx), %xmm1
++	TOLOWER (%xmm0, %xmm1)
++	pcmpistri $0x1a, %xmm1, %xmm0
++# endif
+ 	.p2align 4
+ LABEL(use_sse4_2_exit):
+ 	jnc	LABEL(strcmp_exitz_sse4_2)