kmymoney4 @4.8.4+20200617-f76ab094 does not install on Big Sur due to gwenhywfar4 build errors

[allisti]

When I try to install kmymoney4 on Big Sur with Xcode 12, I get build errors from gwenhywfar4. The errors in the log file are as follows:

:info:build libtest.m:57:2: error: implicit declaration of function 'test1' is invalid in C99 [-Werror,-Wimplicit-function-declaration]:info:build test1();:info:build ^{:info:build libtest.m:88:6: error: implicit declaration of function 'Cocoa_Gui_new' is invalid in C99 [-Werror,-Wimplicit-function-declaration]:info:build gui=Cocoa_Gui_new();:info:build} :info:build libtest.m:88:5: warning: incompatible integer to pointer conversion assigning to 'GWEN_GUI *' (aka 'struct GWEN_GUI *') from 'int' [-Wint-conversion]:info:build gui=Cocoa_Gui_new();:info:build ^{~:info:build libtest.m:93:6: error: implicit declaration of function 'Dlg_Test1_new' is invalid in C99 [-Werror,-Wimplicit-function-declaration]:info:build dlg=Dlg_Test1_new();:info:build}