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-rw-r--r--pkgs/development/libraries/scrollkeeper/default.nix4
1 files changed, 2 insertions, 2 deletions
diff --git a/pkgs/development/libraries/scrollkeeper/default.nix b/pkgs/development/libraries/scrollkeeper/default.nix
index 33cd0489af2e..5d86dff1e0e1 100644
--- a/pkgs/development/libraries/scrollkeeper/default.nix
+++ b/pkgs/development/libraries/scrollkeeper/default.nix
@@ -1,8 +1,8 @@
 { stdenv, fetchurl, perl, libxml2, libxslt, docbook_xml_dtd
 , perlXMLParser}:
 
-assert !isNull perl && !isNull libxml2 && !isNull libxslt
-  && !isNull docbook_xml_dtd && !isNull perlXMLParser;
+assert perl != null && libxml2 != null && libxslt != null
+  && docbook != null_xml_dtd && perlXMLParser != null;
 
 # !!! seems to need iconv, but cannot find it since $glibc/bin is not in PATH