Index: Source/cmCoreTryCompile.cxx
===================================================================
RCS file: /cvsroot/CMake/CMake/Source/cmCoreTryCompile.cxx,v
retrieving revision 1.12
diff -u -r1.12 cmCoreTryCompile.cxx
--- Source/cmCoreTryCompile.cxx	29 Jan 2009 20:23:18 -0000	1.12
+++ Source/cmCoreTryCompile.cxx	19 May 2009 14:09:02 -0000
@@ -250,6 +250,20 @@
       flag += this->Makefile->GetSafeDefinition("CMAKE_OSX_ARCHITECTURES");
       cmakeFlags.push_back(flag);
       }
+    /* on APPLE also pass CMAKE_OSX_SYSROOT to the try_compile */
+    if(this->Makefile->GetDefinition("CMAKE_OSX_SYSROOT")!=0)
+      {
+      std::string flag="-DCMAKE_OSX_SYSROOT=";
+      flag += this->Makefile->GetSafeDefinition("CMAKE_OSX_SYSROOT");
+      cmakeFlags.push_back(flag);
+      }
+    /* on APPLE also pass CMAKE_OSX_DEPLOYMENT_TARGET to the try_compile */
+    if(this->Makefile->GetDefinition("CMAKE_OSX_DEPLOYMENT_TARGET")!=0)
+      {
+      std::string flag="-DCMAKE_OSX_DEPLOYMENT_TARGET=";
+      flag += this->Makefile->GetSafeDefinition("CMAKE_OSX_DEPLOYMENT_TARGET");
+      cmakeFlags.push_back(flag);
+      }
 
     fprintf(fout, "ADD_EXECUTABLE(cmTryCompileExec \"%s\")\n",source.c_str());
     fprintf(fout,