From 68bd1c8552babfc35e4a2acd2f8727e5e4397b07 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Dani=C3=ABl=20de=20Kok?= <me@danieldk.eu>
Date: Sun, 19 Jul 2020 15:18:04 +0200
Subject: [PATCH] blas: do not report an empty line for every checked symbol

---
 pkgs/build-support/alternatives/blas/default.nix | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pkgs/build-support/alternatives/blas/default.nix b/pkgs/build-support/alternatives/blas/default.nix
index bdee6688a74..9e1aacfaf82 100644
--- a/pkgs/build-support/alternatives/blas/default.nix
+++ b/pkgs/build-support/alternatives/blas/default.nix
@@ -72,7 +72,7 @@ stdenv.mkDerivation {
 
   nm -an "$libblas" | cut -f3 -d' ' > symbols
   for symbol in ${toString blasFortranSymbols}; do
-    grep "^$symbol_$" symbols || { echo "$symbol" was not found in "$libblas"; exit 1; }
+    grep -q "^$symbol_$" symbols || { echo "$symbol" was not found in "$libblas"; exit 1; }
   done
 
   cp -L "$libblas" $out/lib/libblas${canonicalExtension}