The package must prepared for correct usage of GNU autotools, once distribution is only with configure.ac and Makefile.am.
The build could be done completely by cross toolchain with sys-root. The packages should added in cross toolchain by the distribution package management (yum - Fedora 21).
The build could be done by cross compile from scratch. All depended packages could collected and the pkc-config, aclocals must include the depended package folder.
May both could be supported.
Best regards!