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recompiling php (using'make clean; make') after the fp patch is applied would solve the problem.
once this modification is made then build the binary rpm as follows:

powerdevil was compiled without xss and xext support, or the xsync extension is not available. determining idle time will not be possible. please consider recompiling powerdevil with at least one of these two libraries.
powerdevil이 xss와 xext 지원 없이 컴파일되었거나 xsync 지원을 사용할 수 없습니다. 대기 시간을 측정할 수 없습니다. 이 두 라이브러리 중 최소한 하나를 포함하여 powerdevil을 다시 컴파일하십시오.

recompiling php 4, and adding the path to mysql to the flag, '--with-mysql= / your / path / to / mysql' usually solves the problem.
most likely what has happened is, php 4 was compiled with the '--with-mysql' option, without specifying the path to mysql. this means php is using its built-in mysql client library. if your system is running applications, such as php 3 as a concurrent apache module, or auth-mysql, that use other versions of mysql clients, then there is a conflict between the two differing versions of those clients.