Prefer dependency on "%{_bindir}/ruby".

rubypick might not be available everywhere, while "%{_bindir}/ruby"
always is.

sdljava.spec

@@ -7,7 +7,7 @@
 
 Name:           sdljava
 Version:        0.9.1
-Release:        37%{?dist}
+Release:        38%{?dist}
 Summary:        Java binding to the SDL API
 License:        LGPLv2+
 URL:            http://sdljava.sourceforge.net/
@@ -35,7 +35,7 @@ BuildRequires:  jdom
 BuildRequires:  xml-commons-apis
 
 BuildRequires:  jruby
-BuildRequires:  rubypick
+BuildRequires:  %{_bindir}/ruby
 
 Requires:       java
 Requires:       javapackages-tools
@@ -221,6 +221,9 @@ ln -s ../../fonts/dejavu/DejaVuSans-BoldOblique.ttf \
 
 
 %changelog
+* Thu Oct 26 2017 Vít Ondruch <vondruch@redhat.com> - 0.9.1-38
+- Prefer dependency on "%%{_bindir}/ruby".
+
 * Mon Sep 04 2017 Michael Simacek <msimacek@redhat.com> - 0.9.1-37
 - Fix build on s390x