diff --git a/common/global-defs b/common/global-defs
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+# -*- shell mode -*-
+#
+# Sets globally the minimal versions required by the xbps source packages.
+#
+# =========================================================
+# DO NOT MODIFY THIS FILE WITHOUT PRIOR WRITTEN PERMISSION!
+# =========================================================
+#
+# Every time a new source package requires a specific feature from a new
+# 'xbps-src', 'xbps' or 'base-chroot' package, that version must be
+# increased to "reproduce" the build behaviour (somewhat :-).
+
+# xbps-src version.
+XBPS_SRC_REQ=30
+
+# XBPS utils version.
+XBPS_UTILS_REQ=0.17
+
+# XBPS utils API version.
+XBPS_UTILS_API_REQ=20120930
+
+# base-chroot version.
+BASE_CHROOT_REQ=0.29