Failing builds

[Jason at zx2c4.com (Jason A. Donenfeld)]

zx2c4 at thinkpad ~ $ cat /usr/lib/pkgconfig/lua.pc
# lua.pc -- pkg-config data for Lua

# vars from install Makefile

# grep '^V=' ../Makefile
V= 5.1
# grep '^R=' ../Makefile
R= 5.1.5

# grep '^INSTALL_.*=' ../Makefile | sed 's/INSTALL_TOP/prefix/'
prefix= /usr
INSTALL_BIN= ${prefix}/bin
INSTALL_INC= ${prefix}/include
INSTALL_LIB= ${prefix}/lib64
INSTALL_MAN= ${prefix}/man/man1
INSTALL_LMOD= ${prefix}/share/lua/${V}
INSTALL_CMOD= ${prefix}/lib64/lua/${V}

# canonical vars
exec_prefix=${prefix}
libdir=${exec_prefix}/lib64
includedir=${prefix}/include

Name: Lua
Description: An Extensible Extension Language
Version: ${R}
Requires:
Libs: -L${libdir} -llua -lm
Cflags: -I${includedir}

# (end of lua.pc)
zx2c4 at thinkpad ~ $ pkg-config --libs lua
-llua -lm