SHARED_LIBS enumerates the libraries like so:
SHARED_LIBS= foo 1.0 \
zop 2.5 \
tag 3.0
This just defines LIBfoo_VERSION=1.0, LIBzop_VERSION=2.5, LIBtag_VERSION=3.0
and adds these to SUBST_VAR, further tweaks must be done, usually at the
MAKE_FLAGS/MAKE_ENV level.
For gnu ports that use automake, the supplementary MODGNU_SHARED_LIBS
variable can be used like this:
MODGNU_SHARED_LIBS= foo '-no-undefined'
and it will define libfoo_la_LD_FLAGS=--version-info 1:0:0 -no-undefined
Some gnu ports have weird variable names for libraries. For instance,
the libORBit-2 is set using libORBit_2.
LIBORbit-2_ALIAS=ORBit_2
will make sure the correct name is used.
much feedback from bernd@
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