From 303beb15791ee60f7cfec4db4b19d0544e662586 Mon Sep 17 00:00:00 2001
From: Thomas White <taw@physics.org>
Date: Fri, 9 Aug 2019 17:27:24 +0200
Subject: rtnl_list: Accept gdc(num,den) = -1 as well

---
 libcrystfel/src/rational.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libcrystfel/src/rational.c b/libcrystfel/src/rational.c
index 5138c3e9..335685e0 100644
--- a/libcrystfel/src/rational.c
+++ b/libcrystfel/src/rational.c
@@ -236,7 +236,7 @@ Rational *rtnl_list(signed int num_min, signed int num_max,
 			if ( (n>0) && (rtnl_cmp(list[n-1], r)==0) ) continue;
 
 			/* Can be reduced? */
-			if ( gcd(num, den) != 1 ) continue;
+			if ( abs(gcd(num, den)) != 1 ) continue;
 
 			list[n++] = r;
 		}
-- 
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