add notice about Mac OS X not supported for the build script

CHANGELOG.md

@@ -4,7 +4,7 @@ v0.12.1 (unreleased)
 * **#1504**: **[qt]** fix rendering issues for JPEG with XMP metadata
 * **#1507**: **[qt]** fix crash when CSS widows are specified
 * **#1509**: fix TOC support which was broken after upgrade to latest QT
-* **#1512**: fix crashes when rendering JPEG images on Windows Server 2008 x64
+* **#1512**: **[qt]** fix crashes when rendering JPEG images on Windows Server 2008 x64
 * **#1536**: produce selectable text on Mac OSX via --native-format-printer
 * **#1544**: use UTF-8 encoding for the HTML generated by the TOC XSL
 * **#1546**: fix problem with non-ASCII characters in output path on Windows
@@ -14,7 +14,7 @@ v0.12.1 (unreleased)
 * fix compilation failures when not building with patched QT/WebKit
 * generate API documentation for libwkhtmltox (on the website)
 * display version in compiled binary properly under various scenarios
-* introduce a single unified build script for Windows and Linux
+* introduce a single unified build script for Windows and Linux (Mac OS X not supported for now)
 
 v0.12.0 (2014-02-06)
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