From 9bebf316a77f2e85d7607f0ee61eace259a32803 Mon Sep 17 00:00:00 2001
From: Mateusz Pusz <mateusz.pusz@gmail.com>
Date: Wed, 11 Dec 2019 08:27:12 +0100
Subject: [PATCH] gcc-9.1 build fixed

---
 src/include/units/base_dimension.h | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/src/include/units/base_dimension.h b/src/include/units/base_dimension.h
index 2df37dc4..bdf19e77 100644
--- a/src/include/units/base_dimension.h
+++ b/src/include/units/base_dimension.h
@@ -57,12 +57,21 @@ struct base_dimension {
 // BaseDimension
 namespace detail {
 
+#if __GNUC__ == 9 && __GNUC_MINOR__ < 2
+
+template<typename T>
+inline constexpr bool is_base_dimension = true;
+
+#else
+
 template<typename T>
 inline constexpr bool is_base_dimension = false;
 
 template<basic_fixed_string Name, typename... Params>
 inline constexpr bool is_base_dimension<base_dimension<Name, Params...>> = true;
 
+#endif
+
 }  // namespace detail
 
 template<typename T>