From 78e396b2b7b5d2b336768c7575ed9b6ec423fc59 Mon Sep 17 00:00:00 2001
From: Emmanuel Bachlitzanakis
 <115871174+EmBachlitzanakis@users.noreply.github.com>
Date: Wed, 14 Jan 2026 14:01:57 +0200
Subject: [PATCH] Feature#1129-CMake Error: ALIAS target "Boost::system" name
 collision when using vcpkg and FetchContent

---
 CMakeLists.txt | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 48693423a2..7b58e36073 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -103,7 +103,9 @@ if(CROW_USE_BOOST)
 	if(Boost_VERSION VERSION_LESS 1.89)
 		find_package(Boost 1.64 COMPONENTS system REQUIRED)
 	else()
-		add_library(Boost::system ALIAS Boost::headers)
+		if(NOT TARGET Boost::system)
+			add_library(Boost::system ALIAS Boost::headers)
+		endif()
 	endif()
 	target_link_libraries(Crow
 		INTERFACE