Description:
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I am interested in updating the PHP package for OpenWrt, a Linux distribution for routers and other similar devices. Due to the wide variety of devices supported, packagers generally cross compile OpenWrt packages.

It seems that PHP 5.6.4 is a little more difficult to cross compile than OpenWrt's last supported version, 5.4.36. For example, 5.6.4's "./configure ..." prints an error which states that the test program responsible for checking for the existence of strcasestr cannot run. (The reason it cannot run is that it was not compiled for the host architecture.)

Actual result:
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[...]
checking whether to enable EXIF (metadata from images) support... yes, shared
checking for fileinfo support... yes, shared
checking for strcasestr... configure: error: in `/home/mike/Source/openwrt/openwrt/build_dir/target-mips_34kc_uClibc-0.9.33.2/php-5.6.6':
configure: error: cannot run test program while cross compiling
See `config.log' for more details
Makefile:518: recipe for target '/home/mike/Source/openwrt/openwrt/build_dir/target-mips_34kc_uClibc-0.9.33.2/php-5.6.6/.configured_nynyyynnnnnyynnynnynynnynynynnnnnnnynnnyyy' failed
make[2]: *** [/home/mike/Source/openwrt/openwrt/build_dir/target-mips_34kc_uClibc-0.9.33.2/php-5.6.6/.configured_nynyyynnnnnyynnynnynynnynynynnnnnnnynnnyyy] Error 1
make[2]: Leaving directory '/home/mike/Source/openwrt/openwrt/feeds/packages/lang/php5'
package/Makefile:173: recipe for target 'package/feeds/packages/php5/compile' failed
make[1]: *** [package/feeds/packages/php5/compile] Error 2
make[1]: Leaving directory '/home/mike/Source/openwrt/openwrt'
/home/mike/Source/openwrt/openwrt/include/toplevel.mk:171: recipe for target 'package/php5/compile' failed
make: *** [package/php5/compile] Error 2