configure.ac: build examples by default

configure.ac

@@ -1399,9 +1399,9 @@ fi
 #                                                                             #
 ###############################################################################
 
-AC_ARG_ENABLE(build-examples, [AS_HELP_STRING([--enable-build-examples],
-			[enable building of examples])],
-			enable_build_examples=$enableval, enable_build_examples=no)
+AC_ARG_ENABLE(build-examples, [AS_HELP_STRING([--disable-build-examples],
+			[disable building of examples])],
+			enable_build_examples=$enableval, enable_build_examples=yes)
 # check stuff for examples (todo)
 AM_CONDITIONAL(BUILD_EXAMPLES, [test x$enable_build_examples != xno])
 AC_ARG_ENABLE(opengl-render, [AS_HELP_STRING([--enable-opengl-render],