When I make sdk_install_pkg with USE_OPT_LIBS=0, the openssl headers is not packed into the install package

hi
I try to use sgxssl in sgxsdk instead of ipp, so I build the package with:
make USE_OPT_LIBS=0 sdk_install_package
Then I run the output bin file in linux/install directory to install the sdk package.
But I found there is no openssl headers in sgxsdk/include directory. Since sgxssl modified the openssl headers, such as redirect the pthread.h instead of the default one in OS. I have manaully copy the related headers into sgxsdk/include directory.
Is that a defect?