I'm sorry. I got the problems described above in 01/2021, asked the same question at Stackoverflow but got no useful response. So I decided to ask here at perlmonks - without reproducing the problems again bevor posting. There is a new DBD::Sybase version available at CPAN which seems to address a few of the problems. The Sybase version is now detected correctly and there are no longer errors in the generated makefile. It still won't work anyway. I get 
Warning (mostly harmless): No library found for -llibsybct.lib
Warning (mostly harmless): No library found for -llibsybcs.lib
Warning (mostly harmless): No library found for -llibsybtcl.lib
Warning (mostly harmless): No library found for -llibsybcomn.lib
Warning (mostly harmless): No library found for -llibsybintl.lib
Warning (mostly harmless): No library found for -llibsybblk.lib

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from Makefile.PL. After running cmake I get these errors: 
"C:\Strawberry\perl\bin\perl.exe" -MExtUtils::Mksymlists \
     -e "Mksymlists('NAME'=>\"DBD::Sybase\", 'DLBASE' => 'Sybase', 'DL
+_FUNCS' => {  }, 'FUNCLIST' => [], 'IMPORTS' => {  }, 'DL_VARS' => []
+);"
g++ Sybase.def -o blib\arch\auto\DBD\Sybase\Sybase.xs.dll -mdll -s -L"
+C:\STRAWB~1\perl\lib\CORE" -L"C:\STRAWB~1\c\lib" Sybase.o dbdimp.o   
+"C:\STRAWB~1\perl\lib\CORE\libperl532.a" "C:\STRAWB~1\c\x86_64-w64-mi
+ngw32\lib\libm.a" "C:\STRAWB~1\c\x86_64-w64-mingw32\lib\libmoldname.a
+" "C:\STRAWB~1\c\x86_64-w64-mingw32\lib\libkernel32.a" "C:\STRAWB~1\c
+\x86_64-w64-mingw32\lib\libuser32.a" "C:\STRAWB~1\c\x86_64-w64-mingw3
+2\lib\libgdi32.a" "C:\STRAWB~1\c\x86_64-w64-mingw32\lib\libwinspool.a
+" "C:\STRAWB~1\c\x86_64-w64-mingw32\lib\libcomdlg32.a" "C:\STRAWB~1\c
+\x86_64-w64-mingw32\lib\libadvapi32.a" "C:\STRAWB~1\c\x86_64-w64-ming
+w32\lib\libshell32.a" "C:\STRAWB~1\c\x86_64-w64-mingw32\lib\libole32.
+a" "C:\STRAWB~1\c\x86_64-w64-mingw32\lib\liboleaut32.a" "C:\STRAWB~1\
+c\x86_64-w64-mingw32\lib\libnetapi32.a" "C:\STRAWB~1\c\x86_64-w64-min
+gw32\lib\libuuid.a" "C:\STRAWB~1\c\x86_64-w64-mingw32\lib\libws2_32.a
+" "C:\STRAWB~1\c\x86_64-w64-mingw32\lib\libmpr.a" "C:\STRAWB~1\c\x86_
+64-w64-mingw32\lib\libwinmm.a" "C:\STRAWB~1\c\x86_64-w64-mingw32\lib\
+libversion.a" "C:\STRAWB~1\c\x86_64-w64-mingw32\lib\libodbc32.a" "C:\
+STRAWB~1\c\x86_64-w64-mingw32\lib\libodbccp32.a" "C:\STRAWB~1\c\x86_6
+4-w64-mingw32\lib\libcomctl32.a" -Wl,--enable-auto-image-base
C:/Strawberry/c/bin/../lib/gcc/x86_64-w64-mingw32/8.3.0/../../../../x8
+6_64-w64-mingw32/bin/ld.exe: dbdimp.o:dbdimp.c:(.text+0xd51): undefin
+ed reference to `ct_options'
C:/Strawberry/c/bin/../lib/gcc/x86_64-w64-mingw32/8.3.0/../../../../x8
+6_64-w64-mingw32/bin/ld.exe: dbdimp.o:dbdimp.c:(.text+0xe15): undefin
+ed reference to `ct_cmd_alloc'
C:/Strawberry/c/bin/../lib/gcc/x86_64-w64-mingw32/8.3.0/../../../../x8
+6_64-w64-mingw32/bin/ld.exe: dbdimp.o:dbdimp.c:(.text+0xef4): undefin
+ed reference to `ct_config'
C:/Strawberry/c/bin/../lib/gcc/x86_64-w64-mingw32/8.3.0/../../../../x8
+6_64-w64-mingw32/bin/ld.exe: dbdimp.o:dbdimp.c:(.text+0xf34): undefin
+ed reference to `ct_config'
C:/Strawberry/c/bin/../lib/gcc/x86_64-w64-mingw32/8.3.0/../../../../x8
+6_64-w64-mingw32/bin/ld.exe: dbdimp.o:dbdimp.c:(.text+0xfae): undefin
+ed reference to `ct_con_alloc'
C:/Strawberry/c/bin/../lib/gcc/x86_64-w64-mingw32/8.3.0/../../../../x8
+6_64-w64-mingw32/bin/ld.exe: dbdimp.o:dbdimp.c:(.text+0xff1): undefin
+ed reference to `ct_con_props'
... (many more) ...

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The linking process seems to ignore the library directory of the Sybase installation. The library paths are set in Makefile.PL with my $lddlflags = $Config{lddlflags};. I don't know where to configure this and added the Sybase library directory manually to $lddlflags. 
$lddlflags .= '-L"c:\SAP\OCS-16_0\dll\"';

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Now I get 
"C:\Strawberry\perl\bin\perl.exe" -MExtUtils::Mksymlists \
     -e "Mksymlists('NAME'=>\"DBD::Sybase\", 'DLBASE' => 'Sybase', 'DL
+_FUNCS' => {  }, 'FUNCLIST' => [], 'IMPORTS' => {  }, 'DL_VARS' => []
+);"
g++ Sybase.def -o blib\arch\auto\DBD\Sybase\Sybase.xs.dll -mdll -s -L"
+C:\STRAWB~1\perl\lib\CORE" -L"C:\STRAWB~1\c\lib"-L"c:\SAP\OCS-16_0\dl
+l\" Sybase.o dbdimp.o   "C:\STRAWB~1\perl\lib\CORE\libperl532.a" "C:\
+STRAWB~1\c\x86_64-w64-mingw32\lib\libm.a" "C:\STRAWB~1\c\x86_64-w64-m
+ingw32\lib\libmoldname.a" "C:\STRAWB~1\c\x86_64-w64-mingw32\lib\libke
+rnel32.a" "C:\STRAWB~1\c\x86_64-w64-mingw32\lib\libuser32.a" "C:\STRA
+WB~1\c\x86_64-w64-mingw32\lib\libgdi32.a" "C:\STRAWB~1\c\x86_64-w64-m
+ingw32\lib\libwinspool.a" "C:\STRAWB~1\c\x86_64-w64-mingw32\lib\libco
+mdlg32.a" "C:\STRAWB~1\c\x86_64-w64-mingw32\lib\libadvapi32.a" "C:\ST
+RAWB~1\c\x86_64-w64-mingw32\lib\libshell32.a" "C:\STRAWB~1\c\x86_64-w
+64-mingw32\lib\libole32.a" "C:\STRAWB~1\c\x86_64-w64-mingw32\lib\libo
+leaut32.a" "C:\STRAWB~1\c\x86_64-w64-mingw32\lib\libnetapi32.a" "C:\S
+TRAWB~1\c\x86_64-w64-mingw32\lib\libuuid.a" "C:\STRAWB~1\c\x86_64-w64
+-mingw32\lib\libws2_32.a" "C:\STRAWB~1\c\x86_64-w64-mingw32\lib\libmp
+r.a" "C:\STRAWB~1\c\x86_64-w64-mingw32\lib\libwinmm.a" "C:\STRAWB~1\c
+\x86_64-w64-mingw32\lib\libversion.a" "C:\STRAWB~1\c\x86_64-w64-mingw
+32\lib\libodbc32.a" "C:\STRAWB~1\c\x86_64-w64-mingw32\lib\libodbccp32
+.a" "C:\STRAWB~1\c\x86_64-w64-mingw32\lib\libcomctl32.a" -Wl,--enable
+-auto-image-base
C:/Strawberry/c/bin/../lib/gcc/x86_64-w64-mingw32/8.3.0/../../../../x8
+6_64-w64-mingw32/bin/ld.exe: cannot export boot_DBD__Sybase: symbol n
+ot defined
collect2.exe: error: ld returned 1 exit status
gmake: *** [Makefile:490: blib\arch\auto\DBD\Sybase\Sybase.xs.dll] Err
+or 1

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In reply to Re^2: Installation of DBD::Sybase with Strawberry Perl by Anonymous Monk
in thread Installation of DBD::Sybase with Strawberry Perl by Anonymous Monk

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