diff --git a/gnu/packages/web.scm b/gnu/packages/web.scm
index 5459a3051d..54fd410df7 100644
--- a/gnu/packages/web.scm
+++ b/gnu/packages/web.scm
@@ -1025,6 +1025,13 @@ to perl-code, for faster generation of access_log lines.")
         (base32
          "02afhlrdq5hh5g8b32fa79fqq5i76qzwfqqvfi9zi57h31szl536"))))
     (build-system perl-build-system)
+    (arguments
+     '(#:phases
+       (modify-phases %standard-phases
+         (add-after 'unpack 'set-env
+           ;; Fix the build with Perl 5.26.0. Try removing this phase for later
+           ;; versions of perl-authen-sasl.
+           (lambda _ (setenv "PERL_USE_UNSAFE_INC" "1") #t)))))
     (propagated-inputs
      `(("perl-digest-hmac" ,perl-digest-hmac)
        ("perl-gssapi" ,perl-gssapi)))
@@ -1969,7 +1976,11 @@ with Encode::decode(locale => $string).")
     (build-system perl-build-system)
     (arguments
      ;; Tests expect to query files at http://stupidfool.org/perl/feeds/
-     `(#:tests? #f))
+     `(#:tests? #f
+       #:phases
+       (modify-phases %standard-phases
+         (add-after 'unpack 'set-env
+           (lambda _ (setenv "PERL_USE_UNSAFE_INC" "1"))))))
     (inputs
      `(("perl-class-errorhandler" ,perl-class-errorhandler)
        ("perl-html-parser" ,perl-html-parser)
@@ -2157,15 +2168,15 @@ in tables within an HTML document, either as text or encoded element trees.")
 (define-public perl-html-tree
   (package
     (name "perl-html-tree")
-    (version "5.03")
+    (version "5.06")
     (source
      (origin
        (method url-fetch)
-       (uri (string-append "mirror://cpan/authors/id/C/CJ/CJM/"
+       (uri (string-append "mirror://cpan/authors/id/K/KE/KENTNL/"
                            "HTML-Tree-" version ".tar.gz"))
        (sha256
         (base32
-         "13qlqbpixw470gnck0xgny8hyjj576m8y24bba2p9ai2lvy76vbx"))))
+         "0vjk4xrybjqs511qrh9cymhpbg9m3jjqr52qr035k6nzrccyndlw"))))
     (build-system perl-build-system)
     (native-inputs
      `(("perl-module-build" ,perl-module-build)
@@ -2458,6 +2469,8 @@ supported.")
         (base32
          "02d84xq1mm53c7jl33qyb7v5w4372vydp74z6qj0vc96wcrnhkkr"))))
     (build-system perl-build-system)
+    (native-inputs
+     `(("perl-module-install" ,perl-module-install)))
     (home-page "http://search.cpan.org/dist/HTTP-Parser-XS")
     (synopsis "Fast HTTP request parser")
     (description "HTTP::Parser::XS is a fast, primitive HTTP request/response
@@ -2504,7 +2517,16 @@ environment from an HTTP::Request.")
     (arguments
      ;; See the discussion of a related tests issue at
      ;; https://lists.gnu.org/archive/html/guix-devel/2015-01/msg00346.html
-     `(#:tests? #f))
+     `(#:tests? #f
+
+       #:phases (modify-phases %standard-phases
+                   (add-before 'configure 'set-search-path
+                     (lambda _
+                       ;; Work around "dotless @INC" build failure.
+                       (setenv "PERL5LIB"
+                               (string-append (getcwd) ":"
+                                              (getenv "PERL5LIB")))
+                       #t)))))
     (home-page "http://search.cpan.org/dist/HTTP-Server-Simple")
     (synopsis "Lightweight HTTP server")
     (description "HTTP::Server::Simple is a simple standalone HTTP daemon with
@@ -3206,6 +3228,7 @@ methods for WebSocket URIs as it does for HTTP URIs.")
     (native-inputs
      `(("perl-test-pod-coverage" ,perl-test-pod-coverage)
        ("perl-test-pod" ,perl-test-pod)
+       ("perl-module-install" ,perl-module-install)
        ("perl-json" ,perl-json)))
     (home-page "http://search.cpan.org/dist/URI-Template")
     (synopsis "Object for handling URI templates")
@@ -3228,7 +3251,18 @@ RFC 6570.")
                 "1fmp9aib1kaps9vhs4dwxn7b15kgnlz9f714bxvqsd1j1q8spzsj"))))
     (build-system perl-build-system)
     (arguments
-     '(#:tests? #f))                        ;XXX: tests require network access
+     '(#:tests? #f                          ;XXX: tests require network access
+
+       #:phases (modify-phases %standard-phases
+                   (add-before 'configure 'set-search-path
+                     (lambda _
+                       ;; Work around "dotless @INC" build failure.
+                       (setenv "PERL5LIB"
+                               (string-append (getcwd) ":"
+                                              (getenv "PERL5LIB")))
+                       #t)))))
+    (native-inputs
+     `(("perl-module-install" ,perl-module-install)))
     (inputs `(("curl" ,curl)))
     (synopsis "Perl extension interface for libcurl")
     (description