FOO_REQD=1.0 being converted to foo>=1.0, one can now directly specify
the dependency pattern as FOO_DEPENDS=foo>=1.0. This allows things like
JPEG_DEPENDS=jpeg-6b, or fancier expressions like for postgresql-lib.
Change existing FOO_REQD definitions in Makefiles to FOO_DEPENDS.
PL/Tcl is a dynamic loadable extension for the PostgreSQL database system
that enables the Tcl language to be used to create functions and
trigger-procedures. It offers most of the capabilities a function
writer has in the C language.