+########################################################################### osl
+have_osl=yes
+OLD_CPPFLAGS="$CPPFLAGS"
+OLD_LD_FLAGS="$LDFLAGS"
+OLD_LIBS="$LIBS"
+AC_ARG_WITH(osl_headers, [AC_HELP_STRING(--with-osl-headers=dir,
+ [look for osl.h also in dir])])
+if test -n "$with_osl_headers"; then
+ osl_cppflags="-I$with_osl_headers"
+ CPPFLAGS="$CPPFLAGS $osl_cppflags"
+fi
+AC_ARG_WITH(osl_libs, [AC_HELP_STRING(--with-osl-libs=dir,
+ [look for libosl also in dir])])
+if test -n "$with_osl_libs"; then
+ osl_libs="-L$with_osl_libs"
+ LDFLAGS="$LDFLAGS $osl_libs"
+fi