patrice@gentoo ~/gentoo/sys-apps/openrc $ cat /usr/lib64/pkgconfig/ncurses.pc 
# pkg-config file generated by gen-pkgconfig
# vile:makemode

prefix=/usr
exec_prefix=${prefix}
libdir=/usr/lib
includedir=${prefix}/include
abi_version=6
major_version=6
version=6.1.20180127

Name: ncurses
Description: ncurses 6.1 library
Version: ${version}
URL: https://invisible-island.net/ncurses
Requires.private: 
Libs:  -lncurses
Libs.private:  
Cflags:  -D_BSD_TYPES -D__BSD_VISIBLE -D_POSIX_C_SOURCE=200112L -D_XOPEN_SOURCE=600