The *config.m4* file adds any extension-specific configuration options. If your extension relies on external libraries and header files, you need to define those in this file and uncomment the *--with-tidy* section. If your extension does not rely on any external libraries, uncomment the *--enable-tidy* section. check with-path SEARCH_PATH="/usr/local /usr" SEARCH_FOR="/include/tidy/tidy.h" if test -r $PHP_TIDY/; then # path given as parameter TIDY_DIR=$PHP_TIDY else # search default path list AC_MSG_CHECKING([for tidy files in default path]) for i in $SEARCH_PATH ; do if test -r $i/$SEARCH_FOR; then TIDY_DIR=$i AC_MSG_RESULT(found in $i) fi done fi dnl if test -z "$TIDY_DIR"; then AC_MSG_RESULT([not found]) AC_MSG_ERROR([Please reinstall the tidy distribution]) fi # --with-tidy -> add include path PHP_ADD_INCLUDE($TIDY_DIR/include) # --with-tidy -> check for lib and symbol presence LIBNAME=tidy # you may want to change this LIBSYMBOL=tidyReleaseDate # you most likely want to change this PHP_CHECK_LIBRARY($LIBNAME,$LIBSYMBOL, [ PHP_ADD_LIBRARY_WITH_PATH($LIBNAME, $TIDY_DIR/lib, TIDY_SHARED_LIBADD) AC_DEFINE(HAVE_TIDYLIB,1,[ ]) ],[ AC_MSG_ERROR([wrong tidy lib version or lib not found]) ],[ -L$TIDY_DIR/lib -lm -ldl ]) dnl PHP_SUBST(TIDY_SHARED_LIBADD) PHP_EXTENSION(tidy, $ext_shared) dnl PHP_NEW_EXTENSION(tidy, tidy.c, $ext_shared) fi ]]> The *ext_skel* script created a sample *tidy.php* script. A quick way to check if your extension is working is to edit this script and add *dl('tidy.so')* to the top. Then run it through your command-line PHP parser: