+AC_CHECK_HEADERS(
+ [irrlicht/irrlicht.h],
+ [
+ IRRLICHT_CFLAGS=-I/usr/include/irrlicht
+ AC_SUBST([IRRLICHT_CFLAGS])
+ ],
+ AC_MSG_ERROR([Irrlicht header files are required to build.])
+)
+
+# Find swig executable
+# http://www.gnu.org/software/autoconf-archive/ax_pkg_swig.html
+AX_PKG_SWIG([], [], [ AC_MSG_ERROR([SWIG is required to build.]) ])
+
+# Enable SWIG C++ support
+# https://www.gnu.org/software/autoconf-archive/ax_swig_enable_cxx.html
+AX_SWIG_ENABLE_CXX