Skip tests that rely on the `amhello' tarball that comes with Automake.
That tarball's `configure' uses #!/bin/sh, but we can't easily patch it.

diff --git a/t/amhello-binpkg.sh b/t/amhello-binpkg.sh
index fa88cc6..d988cee 100755
--- a/t/amhello-binpkg.sh
+++ b/t/amhello-binpkg.sh
@@ -17,6 +17,7 @@
 # Test an example from the manual about the 'amhello' package:
 # using DESTDIR to build simple, no-frills binary packages.
 
+exit 77
 am_create_testdir=empty
 . ./defs || exit 1
 
diff --git a/t/amhello-cflags.sh b/t/amhello-cflags.sh
index 666011f..2a95e3c 100755
--- a/t/amhello-cflags.sh
+++ b/t/amhello-cflags.sh
@@ -18,6 +18,7 @@
 # using VPATH builds to configure the same package with different
 # options.
 
+exit 77
 am_create_testdir=empty
 required=gcc
 . ./defs || exit 1
diff --git a/t/amhello-cross-compile.sh b/t/amhello-cross-compile.sh
index 708abda..2ee4292 100755
--- a/t/amhello-cross-compile.sh
+++ b/t/amhello-cross-compile.sh
@@ -17,6 +17,7 @@
 # Test an example from the manual about the 'amhello' package:
 # cross-compiling a package from Linux/Unix to MinGW.
 
+exit 77
 am_create_testdir=empty
 required=i586-mingw32msvc-gcc
 . ./defs || exit 1
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<div class='path'>path: <a href='/guix/log/?id=48ea09d49210261d0178d5663c51050e8bdb0375'>root</a>/<a href='/guix/log/gnu?id=48ea09d49210261d0178d5663c51050e8bdb0375'>gnu</a>/<a href='/guix/log/gnu/installer?id=48ea09d49210261d0178d5663c51050e8bdb0375'>installer</a>/<a href='/guix/log/gnu/installer/services.scm?id=48ea09d49210261d0178d5663c51050e8bdb0375'>services.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/gnu/installer/services.scm?id=48ea09d49210261d0178d5663c51050e8bdb0375&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
tr><td><span title='2021-09-20 16:01:08 +0200'>2021-09-20</span></td><td><a href='/guix/commit/gnu/packages/chemistry.scm?id=cbb76da1f6fd9a27bb1826274493cc6f33000f18'>gnu: Add python-pymol.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/chemistry.scm (python-pymol): New variable.
</span></span></td><td>Ricardo Wurmus</td></tr>
<tr><td><span title='2021-06-14 00:24:42 -0400'>2021-06-14</span></td><td><a href='/guix/commit/gnu/packages/chemistry.scm?id=ea0a51071e68c37a4c9c25421cf03bc2f442c67b'>gnu: Rename qtbase to qtbase-5.</a><span class='msg-avail'>...<span class='msg-tooltip'>This change was automated via the following command:

$ git ls-files | xargs sed -i 's/,qtbase)/,qtbase-5)/g'
$ git ls-files | xargs sed -i 's/inherit qtbase)/inherit qtbase-5)/g'
$ git ls-files | xargs sed -i 's/package-version qtbase)/package-version qtbase-5)/g'
$ git checkout etc    # to clear some spurious changes

This is done so the qtbase package can be upgraded to version 6 in the
following commit.
</span></span></td><td>Maxim Cournoyer</td></tr>
<tr><td><span title='2021-02-01 12:07:01 -0500'>2021-02-01</span></td><td><a href='/guix/commit/gnu/packages/chemistry.scm?id=1f1c525ac939eefbb433450693aef08fc252e62e'>gnu: openbabel: Update to 3.1.1.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/chemistry.scm (openbabel): Update to 3.1.1.
[source]: Update URI.
[arguments]: Temporarily skip tests on i686-linux.
</span></span></td><td>Kei Kebreau</td></tr>
<tr><td><span title='2021-02-01 12:07:01 -0500'>2021-02-01</span></td><td><a href='/guix/commit/gnu/packages/chemistry.scm?id=35bb3d5ffd84778e1d97eeebc27711f8c35d045b'>gnu: inchi: Update to 1.06.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/chemistry.scm (inchi): Update to 1.06.
[source]: Use HTTPS.
[native-inputs]: Update inchi-doc hash.
</span></span></td><td>Kei Kebreau</td></tr>
<tr><td><span title='2021-01-29 15:19:02 -0500'>2021-01-29</span></td><td><a href='/guix/commit/gnu/packages/chemistry.scm?id=42008264d9fff544ee00c3c109093472b8a92bd2'>gnu: Remove avogadro.</a><span class='msg-avail'>...<span class='msg-tooltip'>This package fails to build and has been superseded by avogadro2.

* gnu/packages/chemistry.scm (avogadro): Remove variable.
* gnu/packages/patches/avogadro-boost148.patch,
gnu/packages/patches/avogadro-eigen3-update.patch,
gnu/packages/patches/avogadro-python-eigen-lib.patch: Delete files.
* gnu/local.mk (dist_patch_DATA): Remove them.
</span></span></td><td>Leo Famulari</td></tr>
<tr><td><span title='2021-01-25 22:21:28 -0500'>2021-01-25</span></td><td><a href='/guix/commit/gnu/packages/chemistry.scm?id=cf31ee0427ad9ac254a7fc2af9a4599d44c22f97'>gnu: Add avogadro2.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/chemistry.scm (avogadro2): New variable.
</span></span></td><td>Kei Kebreau</td></tr>
<tr><td><span title='2021-01-25 22:21:28 -0500'>2021-01-25</span></td><td><a href='/guix/commit/gnu/packages/chemistry.scm?id=1d41f7770182f4225dcb7ab197bf0a5b9cca603a'>gnu: Add avogadrolibs.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/chemistry.scm (avogadrolibs): New variable.
</span></span></td><td>Kei Kebreau</td></tr>
<tr><td><span title='2021-01-25 22:21:28 -0500'>2021-01-25</span></td><td><a href='/guix/commit/gnu/packages/chemistry.scm?id=68dabe3c1c5a40e060d740b0365f066773297880'>gnu: Add libmsym.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/chemistry.scm (libmsym): New variable.
</span></span></td><td>Kei Kebreau</td></tr>
<tr><td><span title='2021-01-25 22:21:28 -0500'>2021-01-25</span></td><td><a href='/guix/commit/gnu/packages/chemistry.scm?id=58dd11038bcddc080fdf7745f0d8f3a8d9a46f8a'>gnu: Add molequeue.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/chemistry.scm (molequeue): New variable.
</span></span></td><td>Kei Kebreau</td></tr>
<tr><td><span title='2021-01-25 22:21:28 -0500'>2021-01-25</span></td><td><a href='/guix/commit/gnu/packages/chemistry.scm?id=daa4728efc14a3c4c3893ba5e4daeda4bbdabf75'>gnu: Add mmtf-cpp.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/chemistry.scm (mmtf-cpp): New variable.
</span></span></td><td>Kei Kebreau</td></tr>
<tr><td><span title='2021-01-25 22:21:28 -0500'>2021-01-25</span></td><td><a href='/guix/commit/gnu/packages/chemistry.scm?id=ead609930f300c8bb274cc1659bb53441cf62df1'>gnu: Add spglib.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/chemistry.scm (spglib): New variable.
</span></span></td><td>Kei Kebreau</td></tr>