libjansson: Add SOVERSION guard

%ci:no-build

packages/libjansson/build.sh

@@ -10,6 +10,18 @@ TERMUX_PKG_BREAKS="libjansson-dev"
 TERMUX_PKG_REPLACES="libjansson-dev"
 TERMUX_PKG_BUILD_IN_SRC=true
 
+termux_step_post_get_source() {
+	# Do not forget to bump revision of reverse dependencies and rebuild them
+	# after SOVERSION is changed.
+	local _SOVERSION=4
+
+	local e=$(sed -n '/^libjansson_la_LDFLAGS/,/^[^\t]/p' src/Makefile.am | \
+			 sed -En 's/\s*-version-info\s+([0-9]+):([0-9]+):([0-9]+).*/\1-\3/p')
+	if [ ! "${e}" ] || [ "${_SOVERSION}" != "$(( "${e}" ))" ]; then
+		termux_error_exit "SOVERSION guard check failed."
+	fi
+}
+
 termux_step_pre_configure() {
 	autoreconf -fi
 }