The libtool current:revision:age numbers change from 4:0:0 to 5:0:1
since new APIs were added (but no existing ones were changed or
removed). Thus, revision is set to 0, current and age are bumped.
Details:
http://www.gnu.org/software/libtool/manual/libtool.html#Updating-version-info
This changes the library filename (e.g. on Linux) from
libsigrok.so.4.0.0 to libsigrok.so.4.1.0, the SONAME
(+symlink) remains the same, though (libsigrok.so.4).
# The algorithm for determining which number to change (and how) is nontrivial!
# http://www.gnu.org/software/libtool/manual/libtool.html#Updating-version-info
# Format: current:revision:age.
-SR_LIB_VERSION_SET([SR_LIB_VERSION], [4:0:0])
+SR_LIB_VERSION_SET([SR_LIB_VERSION], [5:0:1])
AM_CONDITIONAL([WIN32], [test -z "${host_os##mingw*}" || test -z "${host_os##cygwin*}"])