indra/llxuixml/llxuiparser.cpp:32:25: error: expat/expat.h: No such file or directory

To reproduce

1. hg clone -r 4f100e626f2d http://bitbucket.org/lindenlab/viewer-development
   (or any of f4100e6's descendants)
2. build standalone

Expected

build succeeds

Observed

[ 33%] Building CXX object llxuixml/CMakeFiles/llxuixml.dir/llxuiparser.o

indra/llxuixml/llxuiparser.cpp:32:25: error: expat/expat.h: No such file or directory

make[2]: *** [llxuixml/CMakeFiles/llxuixml.dir/llxuiparser.o] Error 1

make[1]: *** [llxuixml/CMakeFiles/llxuixml.dir/all] Error 2

make: *** [all] Error 2

Workaround

Removing the #include omits this error. However, I think expat is now actually used in that file, to this might only work because the header get included indirectly from other includes.

Possible fix

Something along the lines of slviewer-1.18.5.1-standalone_expat_includes.patch (from VWR-2488) is still used today in other files including expat, so it might be the right thing to do here, too.