diff --git a/0001-fix-build-on-big-endian.patch b/0001-fix-build-on-big-endian.patch
new file mode 100644
index 0000000..0a6cabd
--- /dev/null
+++ b/0001-fix-build-on-big-endian.patch
@@ -0,0 +1,122 @@
+From 5fb79e6ccb805b3d94c8bb8eb0990d9944ae7602 Mon Sep 17 00:00:00 2001
+Message-Id: <5fb79e6ccb805b3d94c8bb8eb0990d9944ae7602.1528041417.git.mjg@fedoraproject.org>
+From: Michael J Gruber <mjg@fedoraproject.org>
+Date: Sun, 3 Jun 2018 17:55:46 +0200
+Subject: [PATCH] fix build on big endian
+
+0dc1153 ("Spread of context into all procedures and removal from
+structures", 2017-04-26) missed a few spots that are relevant on big
+endian only.
+
+Add the missing ContextIDs in the call chain so that the build succeeds
+again.
+
+Signed-off-by: Michael J Gruber <mjg@fedoraproject.org>
+---
+ src/cmsmd5.c | 22 +++++++++++-----------
+ 1 file changed, 11 insertions(+), 11 deletions(-)
+
+diff --git a/src/cmsmd5.c b/src/cmsmd5.c
+index 4b8f7f9..dd0925a 100644
+--- a/src/cmsmd5.c
++++ b/src/cmsmd5.c
+@@ -29,7 +29,7 @@
+ #ifdef CMS_USE_BIG_ENDIAN
+ 
+ static
+-void byteReverse(cmsUInt8Number * buf, cmsUInt32Number longs)
++void byteReverse(cmsContext ContextID, cmsUInt8Number * buf, cmsUInt32Number longs)
+ {
+     do {
+ 
+@@ -42,7 +42,7 @@ void byteReverse(cmsUInt8Number * buf, cmsUInt32Number longs)
+ }
+ 
+ #else
+-#define byteReverse(buf, len)
++#define byteReverse(ContextID, buf, len)
+ #endif
+ 
+ 
+@@ -172,7 +172,7 @@ cmsHANDLE  MD5alloc(cmsContext ContextID)
+ 
+ 
+ static
+-void MD5add(cmsHANDLE Handle, cmsUInt8Number* buf, cmsUInt32Number len)
++void MD5add(cmsContext ContextID, cmsHANDLE Handle, cmsUInt8Number* buf, cmsUInt32Number len)
+ {
+     _cmsMD5* ctx = (_cmsMD5*) Handle;
+     cmsUInt32Number t;
+@@ -196,7 +196,7 @@ void MD5add(cmsHANDLE Handle, cmsUInt8Number* buf, cmsUInt32Number len)
+         }
+ 
+         memmove(p, buf, t);
+-        byteReverse(ctx->in, 16);
++        byteReverse(ContextID, ctx->in, 16);
+ 
+         MD5_Transform(ctx->buf, (cmsUInt32Number *) ctx->in);
+         buf += t;
+@@ -205,7 +205,7 @@ void MD5add(cmsHANDLE Handle, cmsUInt8Number* buf, cmsUInt32Number len)
+ 
+     while (len >= 64) {
+         memmove(ctx->in, buf, 64);
+-        byteReverse(ctx->in, 16);
++        byteReverse(ContextID, ctx->in, 16);
+         MD5_Transform(ctx->buf, (cmsUInt32Number *) ctx->in);
+         buf += 64;
+         len -= 64;
+@@ -216,7 +216,7 @@ void MD5add(cmsHANDLE Handle, cmsUInt8Number* buf, cmsUInt32Number len)
+ 
+ // Destroy the object and return the checksum
+ static
+-void MD5finish(cmsProfileID* ProfileID,  cmsHANDLE Handle)
++void MD5finish(cmsContext ContextID, cmsProfileID* ProfileID,  cmsHANDLE Handle)
+ {
+     _cmsMD5* ctx = (_cmsMD5*) Handle;
+     cmsUInt32Number count;
+@@ -232,21 +232,21 @@ void MD5finish(cmsProfileID* ProfileID,  cmsHANDLE Handle)
+     if (count < 8) {
+ 
+         memset(p, 0, count);
+-        byteReverse(ctx->in, 16);
++        byteReverse(ContextID, ctx->in, 16);
+         MD5_Transform(ctx->buf, (cmsUInt32Number *) ctx->in);
+ 
+         memset(ctx->in, 0, 56);
+     } else {
+         memset(p, 0, count - 8);
+     }
+-    byteReverse(ctx->in, 14);
++    byteReverse(ContextID, ctx->in, 14);
+ 
+     ((cmsUInt32Number *) ctx->in)[14] = ctx->bits[0];
+     ((cmsUInt32Number *) ctx->in)[15] = ctx->bits[1];
+ 
+     MD5_Transform(ctx->buf, (cmsUInt32Number *) ctx->in);
+ 
+-    byteReverse((cmsUInt8Number *) ctx->buf, 4);
++    byteReverse(ContextID, (cmsUInt8Number *) ctx->buf, 4);
+     memmove(ProfileID ->ID8, ctx->buf, 16);
+ 
+     _cmsFree(ctx ->ContextID, ctx);
+@@ -291,7 +291,7 @@ cmsBool CMSEXPORT cmsMD5computeID(cmsContext ContextID, cmsHPROFILE hProfile)
+     if (MD5 == NULL) goto Error;
+ 
+     // Add all bytes
+-    MD5add(MD5, Mem, BytesNeeded);
++    MD5add(ContextID,MD5, Mem, BytesNeeded);
+ 
+     // Temp storage is no longer needed
+     _cmsFree(ContextID, Mem);
+@@ -300,7 +300,7 @@ cmsBool CMSEXPORT cmsMD5computeID(cmsContext ContextID, cmsHPROFILE hProfile)
+     memmove(Icc, &Keep, sizeof(_cmsICCPROFILE));
+ 
+     // And store the ID
+-    MD5finish(&Icc ->ProfileID,  MD5);
++    MD5finish(ContextID, &Icc ->ProfileID,  MD5);
+     return TRUE;
+ 
+ Error:
+-- 
+2.18.0.rc0.294.g786209a621
+
diff --git a/mupdf.spec b/mupdf.spec
index fae87be..837fb76 100644
--- a/mupdf.spec
+++ b/mupdf.spec
@@ -1,6 +1,6 @@
 Name:           mupdf
 Version:        1.13.0
-Release:        5%{?dist}
+Release:        6%{?dist}
 Summary:        A lightweight PDF viewer and toolkit
 Group:          Applications/Publishing
 License:        GPLv3
@@ -17,8 +17,9 @@ BuildRequires:  mesa-libGL-devel mesa-libGLU-devel libXi-devel libXrandr-devel
 # to integrate Artifex's changes. 
 Provides:       bundled(lcms2-devel) = 2.9
 # We need to build against the Artifex fork of freeglut so that we are unicode safe.
-Provides:	bundled(freeglut)-devel) = 3.0.0
+Provides:       bundled(freeglut)-devel) = 3.0.0
 Patch0:         %{name}-1.13-openjpeg.patch
+Patch1:         0001-fix-build-on-big-endian.patch
 
 %description
 MuPDF is a lightweight PDF viewer and toolkit written in portable C.
@@ -52,6 +53,7 @@ do
   rm -rf thirdparty/$d
 done
 %patch0 -p1
+%patch1 -p1 -d thirdparty/lcms2
 
 %build
 export XCFLAGS="%{optflags} -fPIC -DJBIG_NO_MEMENTO -DTOFU -DTOFU_CJK"
@@ -90,6 +92,9 @@ update-desktop-database &> /dev/null || :
 %{_libdir}/lib%{name}*.a
 
 %changelog
+* Sun Jun 03 2018 Michael J Gruber <mjg@fedoraproject.org> - 1.13.0-6
+- fix lcms2art build on big endian
+
 * Fri May 18 2018 Michael J Gruber <mjg@fedoraproject.org> - 1.13.0-5
 - fix BR (pulled in by freeglut-devel before)