+PKG_PROG_PKG_CONFIG
+
+AC_PATH_PROGS([DOXYGEN], [doxygen])
+AC_SUBST(DOXYGEN)
+
+#
+# Configure platform-specific stuff.
+#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+case "${host}" in
+ *mingw32*)
+ MINGW32=yes
+ WIN32=yes
+ AC_PATH_PROGS([WINDRES], [windres $host_alias-windres $host_os-windres])
+ if test "x$WINDRES" = x
+ then
+ AC_MSG_ERROR([windres could not be found])
+ fi
+ AC_PATH_PROGS([MAKENSIS], [makensis])
+ ;;
+ *cygwin*)
+ CYGWIN=yes
+ WIN32=yes
+ ;;
+ *-apple-darwin*)
+ MACOSX=yes
+ LIBS="$LIBS -Wl,-framework"
+ ;;
+esac
+
+AM_CONDITIONAL([WIN32], test "$WIN32" = "yes")
+
+
+#
+# Checks for configuration arguments.
+#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+AC_ARG_ENABLE([debug],
+ [ --enable-debug include debugging symbols and features],
+ [debug=$enableval],
+ [debug=no])
+
+AC_ARG_ENABLE([double-precision],
+ [ --enable-double-precision use doubles instead of floats],
+ [double_precision=$enableval],
+ [double_precision=no])
+
+AC_ARG_ENABLE([profile],
+ [ --enable-profile make a binary with code profiling instructions],
+ [profile=$enableval],
+ [profile=no])
+
+AC_ARG_ENABLE([extra-warnings],
+ [ --enable-extra-warnings make the gcc compiler give more warnings],
+ [extra_warnings=$enableval],
+ [extra_warnings=no])
+
+AC_ARG_ENABLE([clock_gettime],
+ [ --enable-clock_gettime use clock_gettime() instead of SDL_GetTicks()],
+ [clock_gettime=$enableval],
+ [clock_gettime=no])
+
+AC_ARG_ENABLE([threads],
+ [ --enable-threads use threads for concurrency where appropriate],
+ [threads=$enableval],
+ [threads=no])
+
+AC_ARG_ENABLE([gtk],
+ [ --enable-gtk enable GTK+ modal dialogs],
+ [gtk=$enableval],
+ [gtk=no])
+
+AC_ARG_ENABLE([qt4],
+ [ --enable-qt4 enable QT modal dialogs],
+ [qt4=$enableval],
+ [qt4=no])
+
+
+if test x$debug = xyes
+then
+ CFLAGS="$CFLAGS -DDEBUG -ggdb -O0 -Wall -Wno-uninitialized"
+ CXXFLAGS="$CXXFLAGS -DDEBUG -ggdb -O0 -Wall -Wno-uninitialized"
+else
+ CFLAGS="$CFLAGS -DNDEBUG"
+ CXXFLAGS="$CXXFLAGS -DNDEBUG"
+fi
+
+if test x$double_precision = xyes
+then
+ AC_DEFINE([USE_DOUBLE_PRECISION], 1,
+ [Define to 1 if you want to use doubles instead of floats.])
+fi
+
+if test x$profile = xyes
+then
+ CFLAGS="$CFLAGS -pg"
+ CXXFLAGS="$CXXFLAGS -pg"
+ AC_DEFINE([PROFILING_ENABLED], 1,
+ [Define to 1 if profiling is built in.])
+fi
+
+if test x$extra_warnings = xyes
+then
+ CFLAGS="$CFLAGS -Wextra -Wno-unused-parameter"
+ CXXFLAGS="$CXXFLAGS -Wextra -Wno-unused-parameter"
+fi
+
+if test x$threads = xyes
+then
+ AC_DEFINE([USE_THREADS], 1,
+ [Define to 1 if you want to use threads when applicable.])
+fi
+
+if test x$gtk = xyes
+then
+ AC_DEFINE([USE_GTK], 1,
+ [Define to 1 if you want to use GTK+ modal dialogs.])
+elif test x$qt4 = xyes
+then
+ AC_DEFINE([USE_QT4], 1,
+ [Define to 1 if you want to use QT4 modal dialogs.])
+fi
+
+
+if test "x$prefix" = xNONE
+then
+ prefix="$ac_default_prefix"
+fi
+
+if test x$WIN32 = xyes
+then
+ DATADIR="data"
+else
+ eval eval DATADIR="${datadir}/$PACKAGE"
+fi
+
+AC_SUBST([DATADIR])
+AC_DEFINE_UNQUOTED([YOINK_DATADIR], ["$DATADIR"],
+ [Define to path of game asset directory.])
+
+
+#
+# Split the version number into components.
+#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+VERSION_MAJOR=$(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.])
+
+if test x$WIN32 = xyes
+then
+ PVERSION="${VERSION_MAJOR:-0}.${VERSION_MINOR:-0}.${VERSION_REVISION:-0}.0"
+ AC_SUBST([PVERSION])
+fi
+
+# these are used in src/yoink.rc
+
+
+#
+# Checks for system functions/headers and compiler characteristics.
+#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+AC_C_STRINGIZE
+AC_C_INLINE
+
+AC_TYPE_UINT8_T
+AC_TYPE_UINT16_T
+AC_TYPE_UINT32_T
+AC_TYPE_SIZE_T
+AC_TYPE_SSIZE_T
+
+AC_FUNC_ERROR_AT_LINE
+AC_FUNC_STRTOD
+AC_CHECK_FUNCS([nanosleep strchr strcspn strrchr strstr])
+
+AC_HEADER_STDBOOL
+AC_HEADER_STDC
+AC_CHECK_HEADERS([stddef.h stdint.h stdlib.h string.h unistd.h])
+
+##### clock_gettime #####
+if test x$clock_gettime = xyes
+then
+ AC_SEARCH_LIBS([clock_gettime], [rt],
+ [AC_DEFINE([HAVE_CLOCK_GETTIME], 1,
+ [Define to 1 if you have the 'clock_gettime' function.])])
+fi
+
+
+#
+# Checks for build dependencies.
+#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+echo "checking for dependencies..."
+
+##### boost #####
+website="http://www.boost.org/"
+BOOST_SMART_PTR
+BOOST_STRING_ALGO
+BOOST_BIND
+BOOST_FUNCTION
+
+##### SDL #####
+website="http://www.libsdl.org/"
+PKG_CHECK_MODULES([SDL], [sdl],
+ [LIBS="$LIBS $SDL_LIBS"
+ CFLAGS="$CFLAGS $SDL_CFLAGS"
+ CXXFLAGS="$CXXFLAGS $SDL_CFLAGS"],
+ [missing=yes
+ echo "***** Missing SDL ($website) *****"])
+
+##### opengl, glu #####
+website="http://www.mesa3d.org/"
+PKG_CHECK_MODULES([OPENGL], [gl glu],
+ [LIBS="$LIBS $OPENGL_LIBS"
+ CFLAGS="$CFLAGS $OPENGL_CFLAGS"
+ CXXFLAGS="$CXXFLAGS $GLU_CFLAGS"],
+ [missing=yes
+ echo "***** Missing OpenGL ($website) *****"])
+
+##### liblua #####
+website="http://www.lua.org/"
+PKG_CHECK_MODULES([LUA], [lua],
+ [LIBS="$LIBS $LUA_LIBS"
+ CFLAGS="$CFLAGS $LUA_CFLAGS"
+ CXXFLAGS="$CXXFLAGS $LUA_CFLAGS"],
+ [missing=yes
+ echo "***** Missing liblua ($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 $PNG_CFLAGS"],
+ [missing=yes
+ echo "***** Missing libpng ($website) *****"])
+
+##### openal #####
+website="http://connect.creativelabs.com/openal/"
+PKG_CHECK_MODULES([OPENAL], [openal],
+ [LIBS="$LIBS $OPENAL_LIBS"
+ CFLAGS="$CFLAGS $OPENAL_CFLAGS"
+ CXXFLAGS="$CXXFLAGS $OPENAL_CFLAGS"],
+ [missing=yes
+ echo "***** Missing OpenAL ($website) *****"])
+
+##### libvorbis #####
+website="http://www.xiph.org/downloads/"
+PKG_CHECK_MODULES([VORBIS], [vorbisfile],
+ [LIBS="$LIBS $VORBIS_LIBS"
+ CFLAGS="$CFLAGS $VORBIS_CFLAGS"
+ CXXFLAGS="$CXXFLAGS $VORBIS_CFLAGS"],
+ [missing=yes
+ echo "***** Missing libvorbisfile ($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 $GTK_CFLAGS"],
+ [missing=yes
+ echo "***** Missing GTK+-2.0 ($website) *****"])
+fi
+
+##### QT4 #####
+if test x$qt4 = xyes
+then
+ website="http://qt.nokia.com/"
+ PKG_CHECK_MODULES([QT], [QtGui],
+ [LIBS="$LIBS $QT_LIBS"
+ CFLAGS="$CFLAGS $QT_CFLAGS"
+ CXXFLAGS="$CXXFLAGS $QT_CFLAGS"],
+ [missing=yes
+ echo "***** Missing QT ($website) *****"])
+fi
+
+
+if test x$missing = xyes
+then
+ AC_MSG_ERROR([Please resolve the missing dependencies, and try again.])
+fi
+
+
+#
+# Find the game resources to install.
+#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+DATA_FILES=$(echo $(cd data && find . -name "*.lua" \
+ -o -name "*.ogg" \
+ -o -name "*.png" \
+ -o -name "yoinkrc"))
+AC_SUBST([DATA_FILES])
+
+
+#
+# Create the build files.
+#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+