From 72491443fceb4651de48aaeb2d6073cb4b5a9678 Mon Sep 17 00:00:00 2001
From: Mateusz Pusz <mateusz.pusz@gmail.com>
Date: Fri, 19 Apr 2024 15:30:42 +0100
Subject: [PATCH] fix: use `std::formattable` only when fmtlib is not used

---
 src/core/include/mp-units/format.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/core/include/mp-units/format.h b/src/core/include/mp-units/format.h
index 14e2c7281..061f676ce 100644
--- a/src/core/include/mp-units/format.h
+++ b/src/core/include/mp-units/format.h
@@ -265,7 +265,7 @@ class MP_UNITS_STD_FMT::formatter<U, Char> {
 // subentity-id                ::= 'N' | 'U' | 'D'
 // format-spec                 ::= <as specified by the formatter for the argument type>
 //
-#if __cpp_lib_format_ranges
+#if __cpp_lib_format_ranges && !MP_UNITS_USE_FMTLIB
 template<auto Reference, typename Char, std::formattable<Char> Rep>
 #else
 template<auto Reference, typename Rep, typename Char>