But I wonder if there's a compiler switch (maybe -std=c++11) that would fix that for you.

Not that I can find.
Having upgraded the ImageMagick executable from release 19 to release 28, I hit the same issue.
To fix, I did a cd to the .cpan build directory and started by removing the failed cpan -fi Image::Magick attempt: 
C:\> cd \Users\Owner\.cpan\build\Image-Magick-7.1.1-18
then
C:\Users\Owner\.cpan\build\Image-Magick-7.1.1-18>gmake realclean
then
C:\Users\Owner\.cpan\build\Image-Magick-7.1.1-18>perl Makefile.PL CC=g
+++
then
C:\Users\Owner\.cpan\build\Image-Magick-7.1.1-18>gmake test
then
C:\Users\Owner\.cpan\build\Image-Magick-7.1.1-18>gmake install

[download]
That worked fine for me, though the single test still failed: 
t/blob.t .......... ok
t/composite.t ..... ok
t/filter.t ........ Failed 1/58 subtests
t/getattribute.t .. ok
t/montage.t ....... ok
t/ping.t .......... ok
t/read.t .......... ok
t/setattribute.t .. ok
t/write.t ......... ok

Test Summary Report
-------------------
t/filter.t      (Wstat: 0 Tests: 58 Failed: 1)
  Failed test:  2
Files=9, Tests=273,  1 wallclock secs ( 0.01 usr +  0.00 sys =  0.01 C
+PU)
Result: FAIL
Failed 1/9 test programs. 1/273 subtests failed.
gmake: *** [makefile:1048: test_dynamic] Error 255

[download]
Update: Looks like that one test fails for me because the font "Generic.ttf" can't be found: 
Annotate(text=>'Magick',geometry=>'+0+20',font=>'Generic.ttf',fill=>'g
+old',gravity=>'North',pointsize=>14) ...
  Annotate (text=>'Magick',geometry=>'+0+20',font=>'Generic.ttf',fill=
+>'gold',gravity=>'North',pointsize=>14):
  Exception 305: unable to read font `Generic.ttf' @ warning/annotate.
+c/RenderType/1024
not ok 2

[download]
Update 2: In the previous versions of Image::Magick that I've built, "Generic.tiff" has been provided in both the "demo" and the "t" folders - though the MANIFEST file listed only "demo/Generic.tiff"..
Now, however, "Generic.tiff" is to be found only in the "demo" folder.
Copying "demo/Generic.tiff" to "t/Generic.tiff" allows all tests to pass.

Cheers,
Rob

In reply to Re^4: Errors While Installing Image::Magick by syphilis
in thread Errors While Installing Image::Magick by roho

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