Building universally doesn't work on Travis, because dependencies are built 64-bit only.

--- a/configure
+++ b/configure
@@ -4497,7 +4497,7 @@ case $host in
                 if test "x$APPLEXCODE" = xyes; then
                 # Apple XCode LLVM:
                   # Flags for building Universal binaries:
-                  C_UNIV_SWITCH="-arch i386 -arch x86_64"
+                  C_UNIV_SWITCH="-arch x86_64"  # XXX don't actually build universal!
                   CFLAGS="$CFLAGS $C_UNIV_SWITCH"
                   # Set LDFLAGS used by utilities:
                   LDFLAGS_BIN="$LDFLAGS_BIN -rpath \${CFITSIO_LIB}"
-- 
2.15.0