Add automake support for --enable-gcc-hidden-visibility.

configure.in.in

@@ -1,10 +1,15 @@
 #MIN_CONFIG
+KDE_ENABLE_HIDDEN_VISIBILITY
+KDE_INIT_DOXYGEN([KDE Utils API Reference], [Version $VERSION])
 
 dnl Checks for header files.
 AC_HEADER_DIRENT
 AC_HEADER_STDC
 AC_CHECK_HEADERS(fcntl.h sys/time.h unistd.h features.h alloca.h linux/awe_voice.h awe_voice.h /usr/src/sys/i386/isa/sound/awe_voice.h /usr/src/sys/gnu/i386/isa/sound/awe_voice.h linux/ucdrom.h sys/stdtypes.h sys/filio.h sys/audioio.h Alib.h sys/sem.h string.h getopt.h machine/endian.h sys/awe_voice.h)
 
+AC_CHECK_SETENV
+AC_CHECK_UNSETENV
+
 dnl First, setup HAVE_LINUX_CDROM_H.
 dnl This gets cached, so later we can selectively
 dnl disable applications by using _CHECK_HEADER