Try #1517:

iohk-bors[bot] · web-flow · commit 206f019ba9f2 · 2022-06-16T08:22:12.000Z
diff --git a/overlays/mingw_w64.nix b/overlays/mingw_w64.nix
@@ -44,6 +44,8 @@ let
       ln -s "$l" "''${l#lib}"
     done
     )
+    # Not sure why this `unset` helps.  It might avoids some kind of overflow issue.  We see `wine` fail to start when building `cardano-wallet-cli` test `unit`.
+    unset pkgsHostTargetAsString
     WINEDLLOVERRIDES="winemac.drv=d" WINEDEBUG=warn-all,fixme-all,-menubuilder,-mscoree,-ole,-secur32,-winediag WINEPREFIX=$TMP ${wine}/bin/wine64 $REMOTE_ISERV/remote-iserv.exe tmp $PORT &
     (>&2 echo "---| remote-iserv should have started on $PORT")
     RISERV_PID="$!"

Original file line number	Diff line number	Diff line change
`@@ -44,6 +44,8 @@ let`
`44`	`44`	`ln -s "$l" "''${l#lib}"`
`45`	`45`	`done`
`46`	`46`	`)`
	`47`	+ # Not sure why this `unset` helps. It might avoids some kind of overflow issue. We see `wine` fail to start when building `cardano-wallet-cli` test `unit`.
	`48`	`+ unset pkgsHostTargetAsString`
`47`	`49`	`WINEDLLOVERRIDES="winemac.drv=d" WINEDEBUG=warn-all,fixme-all,-menubuilder,-mscoree,-ole,-secur32,-winediag WINEPREFIX=$TMP ${wine}/bin/wine64 $REMOTE_ISERV/remote-iserv.exe tmp $PORT &`
`48`	`50`	`(>&2 echo "---\| remote-iserv should have started on $PORT")`
`49`	`51`	`RISERV_PID="$!"`