Don't try to build CD-ROM support on Emscripten.
--- a/extras/buildbot-emscripten.sh Sun Jul 09 17:09:40 2017 -0400
+++ b/extras/buildbot-emscripten.sh Sun Jul 09 17:28:33 2017 -0400
@@ -50,7 +50,6 @@
source "$ENVSCRIPT"
echo "Setting up..."
-set -x
cd "$PHYSFSBASE"
rm -rf buildbot
mkdir buildbot
--- a/src/physfs_platforms.h Sun Jul 09 17:09:40 2017 -0400
+++ b/src/physfs_platforms.h Sun Jul 09 17:28:33 2017 -0400
@@ -61,6 +61,10 @@
# define PHYSFS_PLATFORM_BSD 1
# define PHYSFS_PLATFORM_UNIX 1
# define PHYSFS_PLATFORM_POSIX 1
+#elif defined(__EMSCRIPTEN__)
+# define PHYSFS_NO_CDROM_SUPPORT 1
+# define PHYSFS_PLATFORM_UNIX 1
+# define PHYSFS_PLATFORM_POSIX 1
#elif defined(unix) || defined(__unix__)
# define PHYSFS_PLATFORM_UNIX 1
# define PHYSFS_PLATFORM_POSIX 1