From 9bc4fffd86e245e748589fdb601a944e466e405e Mon Sep 17 00:00:00 2001
From: Karen Arutyunov <karen@codesynthesis.com>
Date: Wed, 29 Nov 2023 17:47:30 +0300
Subject: Fix pkg-build crash for system package specified with version
 constraint except for '/<version>' notation

---
 bpkg/manifest-utility.cxx | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/bpkg/manifest-utility.cxx b/bpkg/manifest-utility.cxx
index 76db3a7..b0b599b 100644
--- a/bpkg/manifest-utility.cxx
+++ b/bpkg/manifest-utility.cxx
@@ -133,12 +133,16 @@ namespace bpkg
     if (s[n] == '\0') // No version (constraint) is specified?
       return nullopt;
 
-    const char* v (s + n); // Constraint or version including '/'.
+    const char* v (s + n); // Constraint or version including leading '/'.
 
-    // If only the version is allowed or the package name is followed by '/'
-    // then fallback to the version parsing.
+    if (version_only && v[0] != '/')
+      fail << "exact package version expected instead of version constraint "
+           << "in '" << s << "'";
+
+    // If the package name is followed by '/' then fallback to the version
+    // parsing.
     //
-    if (version_only || v[0] == '/')
+    if (v[0] == '/')
     try
     {
       return version_constraint (
-- 
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