A number of third-party libraries have added pkg-config support over the years. This patch-set updates configure to make use it where it is available. It also fixes some conflicting option definitions and adds patches that causes configure to fail if a plugin has been explicitly requested but the related third-party library is not available. Patch 1: switch from `--with-blah` to `--enable-blah` for output plugins. Patches 2-5: use pkg-config for libdbi, mysql, libpcap and libpq if available. Patches 6-10: abort configure when an output plugin has been explicitly enabled, but the related library is not available. Jeremy Sowden (10): build: use `--enable-blah` flags for output plugins build: use pkg-config for libdbi build: use pkg-config or upstream M4 for mysql build: use pkg-config or pcap-config for libpcap build: use pkg-config for libpq if available build: if `--enable-dbi` is `yes` abort if DBI is not found build: if `--enable-mysql` is `yes` abort if MySQL is not found build: if `--enable-pcap` is `yes` abort if libpcap is not found build: if `--enable-pgsql` is `yes` abort if libpq is not found build: if `--enable-sqlite3` is `yes` abort if libsqlite3 is not found acinclude.m4 | 351 --------------------------------------- configure.ac | 192 +++++++++++++++++---- output/dbi/Makefile.am | 4 +- output/pgsql/Makefile.am | 4 +- 4 files changed, 161 insertions(+), 390 deletions(-) delete mode 100644 acinclude.m4 -- 2.34.1