libticalcs-4.5.1.ebuild compile cleanly the library but installation doesn't provide ticalcs-config the file is present in the distribution tar.gz but it isn't copied during merging that is needed to compile apps against libticalcs
This is fixed in "libticalcs-4.5.3", now in Portage. Thanks for reporting. FYI, corresponding scripts for other TiLP packages have also been added: - "libticables-3.8.6" provides "ticables-config" - "libtifiles-0.5.9" provides "tifiles-config"