I've applied most to wip-desktop, with the following changes/comments:

nanomsg: not reproducible
nng: not reproducible
libmpeg3 lots of "undeclared" warnings
libtimidity test failed "Could not initialise libTiMidity" in playmidi

directfb not reproducible
│ │ │ -DirectFB/Core: %s Application Core. (2020-07-05 00:00) %s%s
│ │ │ +DirectFB/Core: %s Application Core. (2020-07-04 23:57) %s%s

libde265 misses dependency to libvideogfx

mjpegtools:

>From https://sourceforge.net/projects/mjpegtools/files/mjpegtools/2.1.0/mjpegtools-2.1.0.tar.gz...
>download failed "https://sourceforge.net/projects/mjpegtools/files/mjpegtools/2.1.0/mjpegtools-2.1.0.tar.gz" 404 "Not Found"
Fallback works, though.

libopenmpt: It is not required to propagate mpg123 or vorbis (see .pc file).

srt: not reproducible; massive diff

flite: Applied with the following changes

diff --git a/gnu/packages/speech.scm b/gnu/packages/speech.scm
index 0968b015be..c7fbb986ac 100644
--- a/gnu/packages/speech.scm
+++ b/gnu/packages/speech.scm
@@ -66,7 +66,7 @@
     (arguments
      ;; XXX:
      ;; There numerous issues with the testsuite.
-     ;; Enable them once they are fixed in upstream.
+     ;; Enable all of them once they are fixed in upstream.
      `(#:tests? #f
        #:configure-flags
        (list
@@ -76,25 +76,35 @@
                        "/lib"))
        #:phases
        (modify-phases %standard-phases
+         (add-after 'unpack 'patch-rpath
+           (lambda _
+             (substitute* "main/Makefile"
+              (("flite_LIBS_flags \\+= -Wl,-rpath [^ ]*")
+               "flite_LIBS_flags +="))
+             #t))
+         (delete 'check)
+         ;; Modifying testsuite/Makefile is not done in favor of
+         ;; overriding 'check.
+         ;; The path not taken would be:
+         ;; test:\n\t$(foreach x,$(subst tris1,,$(subst dcoffset_wave,,$(subst flite_test,,$(subst by_word,,$(subst bin2ascii,,$(subst lpc_resynth,,$(subst rfc,,$(subst compare_wave,,$(subst record_in_noise,,$(subst combine_waves,,$(patsubst play_%,,$(subst record_wave,,$(subst lex_lookup,,$(patsubst lpc_test%,,$(patsubst asciiS2U%,,$(patsubst asciiU2S%,,$(ALL))))))))))))))))),echo TEST $x && ./$x data.one && ) true
+         (add-after 'install 'check
+           (lambda _
+             (invoke "make" "-C" "testsuite")
+             (with-directory-excursion "testsuite"
+               (invoke "./token_test")
+               (invoke "./hrg_test")
+               (invoke "./regex_test")
+               (invoke "./nums_test")
+               (invoke "./lex_test")
+               (invoke "./utt_test")
+               (invoke "./multi_thread"))
+             #t))
          (add-after 'install 'remove-static-libs
            (lambda* (#:key outputs #:allow-other-keys)
              (let* ((out (assoc-ref outputs "out")))
                (for-each delete-file
-                         (list
-                          (string-append out "/lib/libflite.a")
-                          (string-append out "/lib/libflite_cmu_grapheme_lang.a")
-                          (string-append out "/lib/libflite_cmu_grapheme_lex.a")
-                          (string-append out "/lib/libflite_cmu_indic_lang.a")
-                          (string-append out "/lib/libflite_cmu_indic_lex.a")
-                          (string-append out "/lib/libflite_cmulex.a")
-                          (string-append out "/lib/libflite_cmu_time_awb.a")
-                          (string-append out "/lib/libflite_cmu_us_awb.a")
-                          (string-append out "/lib/libflite_cmu_us_kal16.a")
-                          (string-append out "/lib/libflite_cmu_us_kal.a")
-                          (string-append out "/lib/libflite_cmu_us_rms.a")
-                          (string-append out "/lib/libflite_cmu_us_slt.a")
-                          (string-append out "/lib/libflite_usenglish.a"))))
-             #t)))))
+                         (find-files out "\\.a$"))
+               #t))))))
     (native-inputs
      `(("perl" ,perl)))
     (inputs

zxing-cpp: Applied with the following changes

diff --git a/gnu/packages/aidc.scm b/gnu/packages/aidc.scm
index 4921ae03a1..2c3df8f42b 100644
--- a/gnu/packages/aidc.scm
+++ b/gnu/packages/aidc.scm
@@ -28,6 +28,7 @@
   #:use-module (guix download)
   #:use-module (guix git-download)
   #:use-module (gnu packages autotools)
+  #:use-module (gnu packages check)
   #:use-module (gnu packages imagemagick)
   #:use-module (gnu packages glib)
   #:use-module (gnu packages gtk)
@@ -54,9 +55,31 @@
        (file-name (git-file-name name version))
        (sha256
         (base32 "011sq8wcjfxbnd8sj6bf2fgkamlp8gj6q835g61c952npvwsnl71"))))
+    (native-inputs
+     `(("googletest-source" ,(package-source googletest))))
     (build-system cmake-build-system)
     (arguments
-     `(#:tests? #f))                    ; No target
+     `(#:out-of-source? #f
+       #:phases
+       (modify-phases %standard-phases
+         (add-after 'unpack 'unpack-googletest
+           ;; Copy the googletest sources to where the CMake build expects them.
+           (lambda* (#:key inputs #:allow-other-keys)
+             (let ((source (assoc-ref inputs "googletest-source"))
+                   (target "test/unit/googletest-src"))
+               (mkdir-p target)
+               (copy-recursively source target)
+               ;; Disable downloading via ExternalProject.
+               (substitute* "test/unit/CMakeLists.txt.in"
+                (("ExternalProject_Add\\(") "message("))
+               #t)))
+         (replace 'check
+           (lambda _
+             (with-directory-excursion "test/unit"
+               (invoke "cmake" ".")
+               (invoke "make")
+               (invoke "./ZXingUnitTest"))
+             #t)))))
     (synopsis "C++ port of ZXing")
     (description "ZXing-CPP is a barcode scanning library.")
     (home-page "https://github.com/nu-book/zxing-cpp")

iqa: Applied with the following changes:

diff --git a/gnu/packages/image.scm b/gnu/packages/image.scm
index 96fb8147a3..9754de03b7 100644
--- a/gnu/packages/image.scm
+++ b/gnu/packages/image.scm
@@ -107,7 +107,7 @@
         (base32 "00mgwy031ammab6bwmd1whhvqv3fxy1cs1igabq0n3ag12zhjs77"))))
     (build-system gnu-build-system)
     (arguments
-     `(#:tests? #f                      ; No target
+     `(#:test-target "test"
        #:phases
        (modify-phases %standard-phases
          (delete 'configure)

libnice: Moved gnutls to regular inputs because it's Requires.private in the .pc file.

gst-plugins-bad: Patch does not apply
gst-plugins-ugly: Patch does not apply
gst-libav: Patch does not apply

tesseract-ocr: Is it really necessary to propagate leptonica?
openni2: Is it really necessary to have JRE and the JDK as REGULAR inputs?  Why?
opesles: Did not review yet.  Do we need that random commit ea5104b?  Is there a release to use instead?
  >+    (license (license:non-copyleft "Refer individual files"))))
  I don't think that's acceptable.  If it were, we could just remove the "license" field of all packages--because that's always true.