libical: Add SOVERSION guard

%ci:no-build

packages/libical/build.sh

@@ -11,3 +11,15 @@ TERMUX_PKG_DEPENDS="libc++, libicu, libxml2"
 TERMUX_PKG_BREAKS="libical-dev"
 TERMUX_PKG_REPLACES="libical-dev"
 TERMUX_PKG_EXTRA_CONFIGURE_ARGS=" -DSHARED_ONLY=true -DICAL_GLIB=false -DUSE_BUILTIN_TZDATA=true -DPERL_EXECUTABLE=/usr/bin/perl"
+
+termux_step_post_get_source() {
+	# Do not forget to bump revision of reverse dependencies and rebuild them
+	# after SOVERSION is changed.
+	local _SOVERSION=3
+
+	local v=$(sed -En 's/^set\(LIBICAL_LIB_MAJOR_VERSION\s+"?([0-9]+).*/\1/p' \
+			CMakeLists.txt)
+	if [ "${v}" != "${_SOVERSION}" ]; then
+		termux_error_exit "SOVERSION guard check failed."
+	fi
+}