adds Known Issue section

README.md

@@ -1,3 +1,5 @@
+# common-dependency-build-helpers-4-apple-hardware
+
 Contains one macOS build script for each dependency and an Xcode project with convenience build aggragates (using the build scripts). 
 
 ## Prerequisites
@@ -98,3 +100,11 @@ Defines the PREFIX directory to save build arttefacts and headers in. It is rela
 There is a `/_config/pEp_versions.plist` where you can configure the version used for pEp dependencies.
 
 For 3rd party dependencies, the version used is hardcoded in the corresponding .code file (e.g. `buildcode/iconv.code`) as it is assumed to use the same 3rd party lib version for all pEp projects (if that assumtion is wrong, please do not chagne the `.code`file but ping the maintainer to the version to `/_config/pEp_versions.plist` ).
+
+## Known Issue
+
+Building sequoia this error is logged:
+
+`/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/objdump:1:1: 'conftest.o': Invalid/Unsupported object file format`
+
+It i yet unknown why that is the case, it seems to not do any harm and it does not return an none zero exit code.