diff --git a/graphviz-2.42.1.tar.gz b/graphviz-2.42.1.tar.gz
deleted file mode 100644
index cf722e3..0000000
--- a/graphviz-2.42.1.tar.gz
+++ /dev/null
@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:9e7c5066a78524853b027301834bf3f65871354930939bf11b66e4049d0fc5bf
-size 25543401
diff --git a/graphviz-addons.spec b/graphviz-addons.spec
index c7ca84c..31d5d8b 100644
--- a/graphviz-addons.spec
+++ b/graphviz-addons.spec
@@ -35,11 +35,7 @@
 %define php_version 5
 %endif
 
-%if 0%{?suse_version} > 1510
-%define ruby_version 2.6
-%else
-%define ruby_version 2.5
-%endif
+%define ruby_version $(pkg-config --variable=RUBY_API_VERSION %{_libdir}/pkgconfig/ruby-*.pc)
 
 # No pkgconfig(gts) in sle12 GA or SPx, but in sle15
 %if 0%{?suse_version} == 1315 && !0%{?is_opensuse}
diff --git a/graphviz.changes b/graphviz.changes
index 172edc6..5b7c64d 100644
--- a/graphviz.changes
+++ b/graphviz.changes
@@ -1,3 +1,8 @@
+-------------------------------------------------------------------
+Thu Mar  5 12:03:06 UTC 2020 - Dominique Leuenberger <dimstar@opensuse.org>
+
+- Auto-identify the correct ruby-version using pkg-config.
+
 -------------------------------------------------------------------
 Mon Jan 13 11:59:55 UTC 2020 - Christian Vögl <cvoegl@suse.de>
 
diff --git a/graphviz.spec b/graphviz.spec
index 8e2fbd5..3a820cb 100644
--- a/graphviz.spec
+++ b/graphviz.spec
@@ -35,11 +35,7 @@
 %define php_version 5
 %endif
 
-%if 0%{?suse_version} > 1510
-%define ruby_version 2.6
-%else
-%define ruby_version 2.5
-%endif
+%define ruby_version $(pkg-config --variable=RUBY_API_VERSION %{_libdir}/pkgconfig/ruby-*.pc)
 
 # No pkgconfig(gts) in sle12 GA or SPx, but in sle15
 %if 0%{?suse_version} == 1315 && !0%{?is_opensuse}