gentoo-overlay/sci-astronomy/esomidas/files/esomidas-17.02-gentoo-setup.patch

--- a/install/unix/preinstall	2017-06-29 23:49:01.295996178 +0000
+++ b/install/unix/preinstall	2017-06-29 23:50:21.835445329 +0000
@@ -124,6 +124,9 @@
 if [ -d "Debian" -a -f "/etc/debian_version" ];  then
     system="Debian"
 
+elif [ -d "Gentoo" -a -f "/etc/gentoo-release" ];  then
+    system="Gentoo"
+
 elif [ "$uname" = "Darwin" ]; then
     system="Darwin"