From 2135b19de96956faf21485a040032b69f8793d56 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Alexandru=20S=C4=83vulescu?= <alexandru.savulescu@epfl.ch>
Date: Mon, 3 Jul 2023 13:02:08 +0200
Subject: [PATCH] fmt: check if target already exists (#1051)

---
 CMakeLists.txt | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 9c88dc4e8..6f7c7392e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -107,7 +107,10 @@ if(NOT TARGET CLI11::CLI11)
 endif()
 # For the moment do not try and use an external Eigen.
 cpp_cc_git_submodule(eigen)
-cpp_cc_git_submodule(fmt BUILD PACKAGE fmt REQUIRED)
+# We could have fmt incoming from NEURON
+if(NOT TARGET fmt)
+  cpp_cc_git_submodule(fmt BUILD PACKAGE fmt REQUIRED)
+endif()
 # If we're building from the submodule, make sure we pass -fPIC so that we can link the code into a
 # shared library later.
 if(NMODL_3RDPARTY_USE_FMT)