Update x86[-64] assembler recommendations
NASM 2.11.08 has a bug that prevents it from properly assembling a
macho64 version of libjpeg-turbo (the resulting binary generates corrupt
images.) 2.11.09 works properly. YASM also works properly and has been
a supported alternative since libjpeg-turbo 1.2.
diff --git a/BUILDING.txt b/BUILDING.txt
index 26a42ca..97bd521 100644
--- a/BUILDING.txt
+++ b/BUILDING.txt
@@ -11,11 +11,14 @@
-- automake 1.7 or later
-- libtool 1.4 or later
--- NASM (if building x86 or x86-64 SIMD extensions)
- * 0.98, or 2.01 or later is required for a 32-bit build
- * NASM 2.00 or later is required for a 64-bit build
- * NASM 2.07 or later is required for a 64-bit build on OS X. This can be
- obtained from MacPorts (http://www.macports.org/).
+-- NASM or YASM (if building x86 or x86-64 SIMD extensions)
+ * NASM 0.98, or 2.01 or later is required for an x86 build (0.99 and 2.00 do
+ not work properly with libjpeg-turbo's x86 SIMD code.)
+ * NASM 2.00 or later is required for an x86-64 build.
+ * NASM 2.07, or 2.11.09 or later is required for an x86-64 Mac build
+ (2.11.08 does not work properly with libjpeg-turbo's x86-64 SIMD code when
+ building macho64 objects.) NASM or YASM can be obtained from MacPorts
+ (http://www.macports.org/).
The binary RPMs released by the NASM project do not work on older Linux
systems, such as Red Hat Enterprise Linux 4. On such systems, you can
