checking whether -lc should be explicitly linked in... no
checking dynamic linker characteristics... GNU/Linux ld.so
checking how to hardcode library paths into programs... immediate
checking whether stripping libraries is possible... yes
checking if libtool supports shared libraries... yes
checking whether to build shared libraries... yes
checking whether to build static libraries... yes
checking whether ln -s works... yes
checking whether make sets $(MAKE)... (cached) yes
checking for pkg-config... /usr/bin/pkg-config
checking pkg-config is at least version 0.9.0... yes
checking for SPIDERMONKEY... configure: error: Package requirements (firefox-js) were not met:

No package 'firefox-js' found

Consider adjusting the PKG_CONFIG_PATH environment variable if you
installed software in a non-standard prefix.

Alternatively, you may set the environment variables SPIDERMONKEY_CFLAGS
and SPIDERMONKEY_LIBS to avoid the need to call pkg-config.
See the pkg-config man page for more details.