After configuring PHP and issuing the make command, I get this error:

ext/mysql/libmysql/my_lib.lo(.text+0x41c): In function `my_dir':
/home/jonathan/php-4.3.1/ext/mysql/libmysql/my_lib.c:169: undefined reference to `errno'
ext/mysql/libmysql/my_lib.lo(.text+0x658): In function `my_stat':
/home/jonathan/php-4.3.1/ext/mysql/libmysql/my_lib.c:588: undefined reference to `errno'
ext/mysql/libmysql/my_malloc.lo(.text+0xe2): In function `my_malloc':
/home/jonathan/php-4.3.1/ext/mysql/libmysql/my_malloc.c:24: undefined reference to `errno'
ext/mysql/libmysql/my_realloc.lo(.text+0xd5): In function `my_realloc':
/home/jonathan/php-4.3.1/ext/mysql/libmysql/my_realloc.c:44: undefined reference to `errno'
ext/mysql/libmysql/my_delete.lo(.text+0x8a): In function `my_delete':
/home/jonathan/php-4.3.1/ext/mysql/libmysql/my_delete.c:16: undefined reference to `errno'
ext/mysql/libmysql/my_tempnam.lo(.text+0x85):/home/jonathan/php-4.3.1/ext/mysql/libmysql/my_tempnam.c:108: more undefined references to `errno' follow
collect2: ld returned 1 exit status
make: *** [sapi/cli/php] Error 1

I also have this problem with PHP 4.3.1