mixed PEAR_Dependency::checkProgram (mixed &$errmsg, string $program)
mixed PEAR_Dependency::checkProgram
External program check method. Looks for executable files in directories listed in the PATH environment variable.
this variable will contains an error message, if check fail
which program to look for
mixed - FALSE if dependency could be resolved successfully(!); or an PEAR_DEPENDENCY_* constant in case of unresolved dependency.
This function can not be called statically.
