Description:
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I was trying to compile php 5.1.2 for my embedded device, running uClibc C library instead of glibc.
./configure in uClibc-based system produces a configuration with HAVE_LOG1P undefined in php_config.h, and in this circumstances compilation fails - it cannot find zif_log1p symbol at link time.
Problem is caused by PHP_FE(log1p,NULL) not properly ifdefed with HAVE_LOG1P macro in php-5.1.2/ext/standard/basic_functions.c.
This tiny patch helps: http://vap.name/tmp/php_5_1_2_have_log1p.patch