Anonymous monk pointed out an obvious error in the invocation, but running perl Makefile.PL followed by gmake gives the same basic error (see below).

This is consistent with CPAN testers so is not a new issue. http://www.cpantesters.org/cpan/report/8aa9fbd0-7033-1014-8ba7-ce7f26264a62.

Thanks for the tip about the makefile. I'm not too worried about getting it to work, though, so won't spend much time looking into it unless I have an idle hour or two.

C:\BERRYB~1\526~1.2_6\data\.cpanm\work\1566809756.26920\Alien-wxWidget
+s-0.69>gmake
C:\berrybrew\5.26.2_64_PDL\perl\bin\perl.exe Build --makefile_env_macr
+os 1
Building Alien-wxWidgets
Argument "0.21_01" isn't numeric in numeric ge (>=) at inc/latest/priv
+ate.pm line 32.
Fetching wxWidgets...
fetching from: http://prdownloads.sourceforge.net/wxwindows/wxWidgets-
+3.0.2.tar.bz2
Extracting wxWidgets...
Argument "0.21_01" isn't numeric in numeric ge (>=) at inc/latest/priv
+ate.pm line 32.
Patching wxWidgets...
Applying patch: C:\BERRYB~1\526~1.2_6\data\.cpanm\work\1566809756.2692
+0\Alien-wxWidgets-0.69\patches\wxMSW-3.0.0-makefiles.patch
perl -pe "" -- "C:\BERRYB~1\526~1.2_6\data\.cpanm\work\1566809756.2692
+0\Alien-wxWidgets-0.69\patches\wxMSW-3.0.0-makefiles.patch" | "..\inc
+\bin\patch.exe" -N -p0 -u -b -z .bak
patching file build/msw/makefile.gcc
Hunk #1 succeeded at 5203 (offset 4 lines).
Hunk #2 succeeded at 5219 (offset 4 lines).
Hunk #3 succeeded at 5239 (offset 4 lines).
Hunk #4 succeeded at 5260 (offset 4 lines).
Hunk #5 succeeded at 5286 (offset 4 lines).
Hunk #6 succeeded at 5313 (offset 4 lines).
Hunk #7 succeeded at 5345 (offset 4 lines).
Hunk #8 succeeded at 5375 (offset 4 lines).
Hunk #9 succeeded at 5405 (offset 4 lines).
Hunk #10 succeeded at 5433 (offset 4 lines).
Hunk #11 succeeded at 5454 (offset 4 lines).
Hunk #12 succeeded at 5480 (offset 4 lines).
Hunk #13 succeeded at 5506 (offset 4 lines).
Hunk #14 succeeded at 5532 (offset 4 lines).
Hunk #15 succeeded at 5558 (offset 4 lines).
Hunk #16 succeeded at 5584 (offset 4 lines).
Hunk #17 succeeded at 5610 (offset 4 lines).
Applying patch: C:\BERRYB~1\526~1.2_6\data\.cpanm\work\1566809756.2692
+0\Alien-wxWidgets-0.69\patches\wxMSW-3.0.1-defs.patch
perl -pe "" -- "C:\BERRYB~1\526~1.2_6\data\.cpanm\work\1566809756.2692
+0\Alien-wxWidgets-0.69\patches\wxMSW-3.0.1-defs.patch" | "..\inc\bin\
+patch.exe" -N -p0 -u -b -z .bak
patching file include/wx/defs.h
Applying patch: C:\BERRYB~1\526~1.2_6\data\.cpanm\work\1566809756.2692
+0\Alien-wxWidgets-0.69\patches\wxMSW-3.0.1-setup_gctx.patch
perl -pe "" -- "C:\BERRYB~1\526~1.2_6\data\.cpanm\work\1566809756.2692
+0\Alien-wxWidgets-0.69\patches\wxMSW-3.0.1-setup_gctx.patch" | "..\in
+c\bin\patch.exe" -N -p0 -u -b -z .bak
patching file include/wx/msw/setup.h
Hunk #1 succeeded at 435 (offset 6 lines).
Hunk #2 succeeded at 577 (offset 6 lines).
Hunk #3 succeeded at 623 (offset 6 lines).
Hunk #4 succeeded at 777 (offset 6 lines).
Hunk #5 succeeded at 785 (offset 6 lines).
Hunk #6 succeeded at 1383 (offset 16 lines).
Hunk #7 succeeded at 1474 (offset 16 lines).
Applying patch: C:\BERRYB~1\526~1.2_6\data\.cpanm\work\1566809756.2692
+0\Alien-wxWidgets-0.69\patches\wxWidgets-2.9.0-magic.patch
perl -pe "" -- "C:\BERRYB~1\526~1.2_6\data\.cpanm\work\1566809756.2692
+0\Alien-wxWidgets-0.69\patches\wxWidgets-2.9.0-magic.patch" | "..\inc
+\bin\patch.exe" -N -p0 -u -b -z .bak
patching file src/generic/grid.cpp
Hunk #1 succeeded at 6125 (offset 528 lines).
Applying patch: C:\BERRYB~1\526~1.2_6\data\.cpanm\work\1566809756.2692
+0\Alien-wxWidgets-0.69\patches\wxWidgets-3.0.2-webkit.patch
perl -pe "" -- "C:\BERRYB~1\526~1.2_6\data\.cpanm\work\1566809756.2692
+0\Alien-wxWidgets-0.69\patches\wxWidgets-3.0.2-webkit.patch" | "..\in
+c\bin\patch.exe" -N -p0 -u -b -z .bak
patching file include/wx/defs.h
Hunk #1 succeeded at 3174 (offset 5 lines).
patching file include/wx/html/webkit.h
patching file include/wx/osx/webview_webkit.h
patching file src/osx/webview_webkit.mm
gmake[1]: Entering directory 'C:/BERRYB~1/526~1.2_6/data/.cpanm/work/1
+566809756.26920/Alien-wxWidgets-0.69/wxWidgets-3.0.2/build/msw'
if not exist gcc_mswudll mkdir gcc_mswudll
process_begin: CreateProcess(NULL, C:/berrybrew/5.26.2_64_PDL/perl/sit
+e/bin/ -c "if not exist gcc_mswudll mkdir gcc_mswudll", ...) failed.
make (e=5): Access is denied.
gmake[1]: [makefile.gcc:5089: gcc_mswudll] Error 5 (ignored)
if not exist ..\..\lib\gcc_dll mkdir ..\..\lib\gcc_dll
process_begin: CreateProcess(NULL, C:/berrybrew/5.26.2_64_PDL/perl/sit
+e/bin/ -c "if not exist ..\..\lib\gcc_dll mkdir ..\..\lib\gcc_dll", .
+..) failed.
make (e=5): Access is denied.
gmake[1]: *** [makefile.gcc:5639: ..\..\lib\gcc_dll] Error 5
gmake[1]: Leaving directory 'C:/BERRYB~1/526~1.2_6/data/.cpanm/work/15
+66809756.26920/Alien-wxWidgets-0.69/wxWidgets-3.0.2/build/msw'
system: gmake -f makefile.gcc all  UNICODE=1 MSLU=0 BUILD=release SHAR
+ED=1  DEBUG_INFO=default DEBUG_FLAG=1 LDFLAGS=" -m64" CPPFLAGS="-m64"
+: 512 at inc/My/Build/Win32.pm line 284.
gmake: *** [Makefile:33: all] Error 2
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