bug#27282: Perl 5.26.0 "dotless @INC"

[Leo Famulari <leo@famulari.name>]

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On Wed, Jun 07, 2017 at 06:37:30PM -0400, Leo Famulari wrote:
> We should set this PERL_USE_UNSAFE_INC variable in the SWIG package
> definition, right? Probably we will need to set it in several other
> packages as well.

I'm testing this patch locally:

diff --git a/gnu/packages/swig.scm b/gnu/packages/swig.scm
index acf052937..09e9bb92a 100644
--- a/gnu/packages/swig.scm
+++ b/gnu/packages/swig.scm
@@ -41,6 +41,14 @@
               (base32
                "0k7ljh07rla6223lhvljgg881b2qr7hmrfgic9a0j1pckpislf99"))))
     (build-system gnu-build-system)
+    (arguments
+     '(#:phases
+       (modify-phases %standard-phases
+         (add-after 'unpack 'set-env
+           ;; Required since Perl 5.26.0's removal of the current
+           ;; working directory from @INC.
+           ;; TODO Try removing this for later versions of SWIG.
+           (lambda _ (setenv "PERL_USE_UNSAFE_INC" "1") #t)))))
     (native-inputs `(("boost" ,boost)
                      ("pcre" ,pcre "bin")))       ;for 'pcre-config'
     (inputs `(;; Provide these to run the corresponding tests.

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