master
build-sys: check linker support for version scripts
build-sys: add AX_COMPARE_VERSION
build-sys: avoid icc warnings "ignoring unknown option"
Revert "build-sys: check for gtk-doc by default"
m4: update pkg.m4
build-sys: use AC_LANG_SOURCE to suppress warnings
fix spelling and typos
build-sys: backport autoconf year2038 macros