$ perl -sl devel.checklib.pl
Can't link/include 'php_main.h'
$ perl -sl devel.checklib.pl -debug 1
# /usr/bin/gcc assertlibSu6peu8p.c -I/usr/local/include -I/usr/local/include/php -I/usr/local/include/php/main -I/usr/local/include/php/TSRM -I/usr/local/include/php/Zend -I/usr/local/include/php/ext -I/usr/local/include/php/ext/date/lib -o assertlib27VD0sdi
In file included from /usr/local/include/php/Zend/zend_globals.h:28,
                 from /usr/local/include/php/main/php_main.h:25,
                 from assertlibSu6peu8p.c:1:
/usr/local/include/php/Zend/zend_globals_macros.h: In function `BEGIN_EXTERN_C':/usr/local/include/php/Zend/zend_globals_macros.h:37: error: storage class specified for parameter `ZEND_API'
/usr/local/include/php/Zend/zend_globals_macros.h:37: error: syntax error before "struct"