diff --git a/maintainers/docs/bugs.txt b/maintainers/docs/bugs.txt
index ed11f657403..28fff6a8253 100644
--- a/maintainers/docs/bugs.txt
+++ b/maintainers/docs/bugs.txt
@@ -56,3 +56,7 @@ include/X11/IntrinsicP.h:202:25: X11/ObjectP.h: No such file or directory
 
 
 * fgrep/egrep: these fail if grep is not in the $PATH.
+
+
+* teTeX: some programs (such as epstopdf) depend on /usr/bin/env, and
+  expect perl to be in the environment.
diff --git a/pkgs/system/all-packages.nix b/pkgs/system/all-packages.nix
index 382e004212e..75a824c6db0 100644
--- a/pkgs/system/all-packages.nix
+++ b/pkgs/system/all-packages.nix
@@ -4,7 +4,7 @@
 # `all-packages-generic.nix' with one of the standard build
 # environments defined in `stdenvs.nix'.
 
-{system}: let {
+{system ? __currentSystem}: let {
   allPackages = import ./all-packages-generic.nix;
 
   stdenvs = import ./stdenvs.nix {inherit system allPackages;};