Description of problem:
php-pecl-mailparse can be installed without php-mbstring which causes the
following error to occur:
PHP Warning:  PHP Startup: Unable to load dynamic library
'/usr/lib64/php/modules/mailparse.so' - /usr/lib64/php/modules/mailparse.so:
undefined symbol: mbfl_convert_filter_new in Unknown on line 0

The php-pecl-mailparse spec file should
Requires: php-mbstring php >= 4.3.0
As indicated by the dependencies listed here:
http://pecl.php.net/package/mailparse


Version-Release number of selected component (if applicable):
php-pecl-mailparse-2.1.1-3.fc5

How reproducible:
The error message shows up upon installing a pear package for example

Steps to Reproduce:
1.  yum remove php-mbstring php-pear-DB php-pecl-mailparse
2.  yum install php-pecl-mailparse (installs without installing php-mbstring)
3.  yum install php-pear-DB (shows error message)
  
Actual results:
Installing php-pecl-mailparse does not install php-mbstring

Expected results:
Installing php-pecl-mailparse installs php-mbstring

Additional info:
Change Requires line in spec file to:
Requires: php-mbstring php >= 4.3.0