fixing libtool script ./ltmain.sh
configure flags: --disable-dependency-tracking --prefix=/tmp/nix-build-qdkkdpsac0if95kgc4qai02dz3wjbwcw-source-tarball.drv-0/tmp_prefix --prefix=/tmp/nix-build-qdkkdpsac0if95kgc4qai02dz3wjbwcw-source-tarball.drv-0/tmp_prefix  
checking for a BSD-compatible install... /nix/store/cwf53pwwkfjnay3bidd0wy6spgb7cw6q-coreutils-6.10/bin/install -c
checking whether build environment is sane... yes
checking for gawk... gawk
checking whether make sets $(MAKE)... yes
checking for pkg-config... /nix/store/i135sfzqm5ppwf4lj9g7n6irbpnnd24r-pkgconfig-0.22/bin/pkg-config
checking pkg-config is at least version 0.9.0... yes
checking whether to enable maintainer-specific portions of Makefiles... no
checking whether CFLAGS is set... no
checking if PKG_CONFIG_PATH needs to be extended for bundled packages... no
checking whether location of aterm is explicitly set using --with-aterm... no
checking whether location of toolbus-ng is explicitly set using --with-toolbus-ng... no
checking for ATERM... yes
checking for TOOLBUS_NG... configure: error: Package requirements (toolbus-ng) were not met:

No package 'toolbus-ng' 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 TOOLBUS_NG_CFLAGS
and TOOLBUS_NG_LIBS to avoid the need to call pkg-config.
See the pkg-config man page for more details.