+PKG_PROG_PKG_CONFIG
+
+AC_PATH_PROGS([CUT], [cut])
+if test x$CUT = x
+then
+ AC_MSG_ERROR([The cut program is required.])
+fi
+
+AC_PATH_PROGS([FIND], [find])
+if test x$FIND = x
+then
+ AC_MSG_ERROR([The find program is required.])
+fi
+
+if test x$WIN32 = xyes
+then
+ AC_PATH_PROGS([WINDRES],
+ [windres $host_alias-windres $host_os-windres])
+ if test x$WINDRES = x
+ then
+ AC_MSG_ERROR([The windres program is required.])
+ fi
+
+ AC_PATH_PROGS([ZIP], [zip])
+ if test x$ZIP = x
+ then
+ AC_MSG_WARN([The zip program is needed to build a portable package.])
+ fi
+
+ AC_PATH_PROGS([MAKENSIS], [makensis])
+ if test x$MAKENSIS = x
+ then
+ AC_MSG_WARN([The makensis program is needed to build an installer.])
+ fi
+
+ AC_PATH_PROGS([GROFF], [groff])
+ if test x$GROFF = x
+ then
+ AC_MSG_WARN([The groff program is needed to create the manual page.])
+ fi
+elif test x$NETBSD = xyes
+then
+ AC_PATH_PROGS([PKGLINT], [pkglint])
+fi
+
+AM_CONDITIONAL([HAVE_MAKENSIS], [test x$MAKENSIS != x])
+
+####
+AC_MSG_NOTICE([Checks for libraries.])
+####
+
+##### SDL #####
+website="http://www.libsdl.org/"
+PKG_CHECK_MODULES([SDL], [sdl],
+ [LIBS="$LIBS $SDL_LIBS"
+ CFLAGS="$CFLAGS $SDL_CFLAGS"
+ CXXFLAGS="$CXXFLAGS $SDL_CFLAGS"],
+ [missing=yes
+ AC_MSG_WARN([Missing SDL ($website)])])
+
+##### opengl, glu #####
+website="http://www.mesa3d.org/"
+PKG_CHECK_MODULES([OPENGL], [gl glu],
+ [LIBS="$LIBS $OPENGL_LIBS"
+ CFLAGS="$CFLAGS $OPENGL_CFLAGS"
+ CXXFLAGS="$CXXFLAGS $OPENGL_CFLAGS"],
+ [missing=yes
+ AC_MSG_WARN([Missing OpenGL ($website)])])
+
+##### libpng #####
+website="http://www.libpng.org/pub/png/libpng.html"
+PKG_CHECK_MODULES([PNG], [libpng],
+ [LIBS="$LIBS $PNG_LIBS"
+ CFLAGS="$CFLAGS $PNG_CFLAGS"
+ CXXFLAGS="$CXXFLAGS $PNG_CFLAGS"],
+ [missing=yes
+ AC_MSG_WARN([Missing libpng ($website)])])
+
+##### openal #####
+website="http://connect.creativelabs.com/openal/"
+PKG_CHECK_MODULES([OPENAL], [openal],
+ [LIBS="$LIBS $OPENAL_LIBS"
+ CFLAGS="$CFLAGS $OPENAL_CFLAGS"
+ CXXFLAGS="$CXXFLAGS $OPENAL_CFLAGS"],
+ [missing=yes
+ AC_MSG_WARN([Missing OpenAL ($website)])])
+
+##### libvorbis #####
+website="http://www.xiph.org/downloads/"
+PKG_CHECK_MODULES([VORBIS], [vorbisfile],
+ [LIBS="$LIBS $VORBIS_LIBS"
+ CFLAGS="$CFLAGS $VORBIS_CFLAGS"
+ CXXFLAGS="$CXXFLAGS $VORBIS_CFLAGS"],
+ [missing=yes
+ AC_MSG_WARN([Missing libvorbisfile ($website)])])
+
+##### liblua #####
+website="http://www.lua.org/"
+PKG_CHECK_MODULES([LUA], [lua],
+ [LIBS="$LIBS $LUA_LIBS"
+ CFLAGS="$CFLAGS $LUA_CFLAGS"
+ CXXFLAGS="$CXXFLAGS $LUA_CFLAGS"],
+ [missing=yes
+ AC_MSG_WARN([Missing liblua ($website)])])
+
+##### GTK+ 2.0 #####
+if test x$gtk = xyes
+then
+ website="http://www.gtk.org/"
+ PKG_CHECK_MODULES([GTK], [gtk+-2.0],
+ [LIBS="$LIBS $GTK_LIBS"
+ CFLAGS="$CFLAGS $GTK_CFLAGS"
+ CXXFLAGS="$CXXFLAGS $GTK_CFLAGS"],
+ [missing=yes
+ AC_MSG_WARN([Missing GTK+-2.0 ($website)])])
+fi
+
+##### QT4 #####
+if test x$qt4 = xyes
+then
+ website="http://qt.nokia.com/"
+ PKG_CHECK_MODULES([QT4], [QtGui],
+ [LIBS="$LIBS $QT4_LIBS"
+ CFLAGS="$CFLAGS $QT4_CFLAGS"
+ CXXFLAGS="$CXXFLAGS $QT4_CFLAGS"],
+ [missing=yes
+ AC_MSG_WARN([Missing QT4 ($website)])])
+fi
+
+if test x$WIN32 = xyes
+then
+ # On Windows, sockets are in the ws2_32 library.
+ LIBS="$LIBS -lws2_32"
+fi
+
+if test x$missing = xyes
+then
+ AC_MSG_ERROR([You are missing some required libraries.])
+fi
+
+
+####
+AC_MSG_NOTICE([Checks for header files.])
+####
+
+AC_HEADER_STDBOOL
+AC_HEADER_STDC
+AC_CHECK_HEADERS([arpa/inet.h byteswap.h fcntl.h stddef.h stdint.h stdlib.h string.h unistd.h])
+
+BOOST_SMART_PTR
+BOOST_STRING_ALGO
+BOOST_BIND
+BOOST_FUNCTION
+
+
+####
+AC_MSG_NOTICE([Checks for types.])
+####
+
+AC_TYPE_UINT8_T
+AC_TYPE_UINT16_T
+AC_TYPE_UINT32_T
+AC_TYPE_UINT64_T
+AC_TYPE_SIZE_T
+
+
+####
+AC_MSG_NOTICE([Checks for compiler characteristics.])
+####
+
+AC_C_STRINGIZE
+AC_C_INLINE
+
+
+####
+AC_MSG_NOTICE([Checks for library functions.])
+####
+
+AC_FUNC_ERROR_AT_LINE
+AC_FUNC_STRTOD
+AC_CHECK_FUNCS([fcntl ioctl nanosleep strchr strcspn strrchr strstr])
+
+if test x$clock_gettime = xyes
+then
+ AC_SEARCH_LIBS([clock_gettime], [rt],
+ [clock_gettime=yes],
+ [clock_gettime=no])
+ if test x$clock_gettime = xyes
+ then
+ AC_DEFINE([HAVE_CLOCK_GETTIME], 1,
+ [Define to 1 if you have the 'clock_gettime' function.])
+ else
+ AC_MSG_WARN([Falling back to SDL_GetTicks().])
+ fi
+fi
+
+
+#
+# Find the game resources to install.
+#
+
+DATA_FILES=$(echo $(cd data && find . -name "*.lua" \
+ -o -name "*.ogg" \
+ -o -name "*.png" \
+ -o -name "yoinkrc"))
+AC_SUBST([DATA_FILES])
+
+
+#
+# Split the version number into components.
+# These definitions are used in the win32 resource file, src/yoink.rc.
+#
+
+VERSION_MAJOR=$(echo $VERSION | cut -d. -f1)
+VERSION_MINOR=$(echo $VERSION | cut -d. -f2)
+VERSION_REVISION=$(echo $VERSION | cut -d. -f3)
+
+AC_DEFINE_UNQUOTED([VERSION_MAJOR], [${VERSION_MAJOR:-0}],
+ [Define to major version number component.])
+
+AC_DEFINE_UNQUOTED([VERSION_MINOR], [${VERSION_MINOR:-0}],
+ [Define to minor version number component.])
+
+AC_DEFINE_UNQUOTED([VERSION_REVISION], [${VERSION_REVISION:-0}],
+ [Define to revision version number component.])
+
+PVERSION="${VERSION_MAJOR:-0}.${VERSION_MINOR:-0}.${VERSION_REVISION:-0}.0"
+AC_SUBST([PVERSION])
+
+if githead=$(git log -n1 --date=short --pretty=format:"%h (%ad)")
+then
+ AC_DEFINE_UNQUOTED([YOINK_GITHEAD], ["$githead"],
+ [Define to the git commit currently checked out.])
+fi
+
+
+#
+# Create the build files.
+#
+