Nest OpenSSL compat headers under MatrixSSL include root

CMakeLists.txt

@@ -42,7 +42,7 @@ if(MATRIXSSL_INSTALL_INCLUDE_SUBDIR STREQUAL "")
 endif()
 set(MATRIXSSL_BUILD_INCLUDE_DIR "${CMAKE_CURRENT_BINARY_DIR}/include")
 set(MATRIXSSL_BUILD_PUBLIC_INCLUDE_DIR "${MATRIXSSL_BUILD_INCLUDE_DIR}/${MATRIXSSL_INSTALL_INCLUDE_SUBDIR}")
-set(MATRIXSSL_BUILD_OPENSSL_INCLUDE_DIR "${MATRIXSSL_BUILD_INCLUDE_DIR}/openssl")
+set(MATRIXSSL_BUILD_OPENSSL_INCLUDE_DIR "${MATRIXSSL_BUILD_PUBLIC_INCLUDE_DIR}/openssl")
 
 set(MATRIXSSL_CONFIG_DIR "${CMAKE_CURRENT_SOURCE_DIR}/configs/${MATRIXSSL_CONFIG}")
 if(NOT EXISTS "${MATRIXSSL_CONFIG_DIR}/cryptoConfig.h" OR
@@ -74,6 +74,8 @@ configure_file("${MATRIXSSL_GENERATED_DIR}/core/config/coreConfig.h"
     "${MATRIXSSL_BUILD_PUBLIC_INCLUDE_DIR}/coreConfig.h" COPYONLY)
 configure_file("${MATRIXSSL_GENERATED_DIR}/crypto/cryptoConfig.h"
     "${MATRIXSSL_BUILD_PUBLIC_INCLUDE_DIR}/cryptoConfig.h" COPYONLY)
+configure_file("${MATRIXSSL_GENERATED_DIR}/crypto/cryptoConfig.h"
+    "${MATRIXSSL_BUILD_PUBLIC_INCLUDE_DIR}/crypto/cryptoConfig.h" COPYONLY)
 configure_file("${MATRIXSSL_GENERATED_DIR}/matrixssl/matrixsslConfig.h"
     "${MATRIXSSL_BUILD_PUBLIC_INCLUDE_DIR}/matrixsslConfig.h" COPYONLY)
 file(COPY "${CMAKE_CURRENT_SOURCE_DIR}/core/include/"
@@ -548,11 +550,6 @@ endif()
 install(DIRECTORY "${MATRIXSSL_BUILD_PUBLIC_INCLUDE_DIR}/"
     DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/${MATRIXSSL_INSTALL_INCLUDE_SUBDIR}
     FILES_MATCHING PATTERN "*.h")
-if(MATRIXSSL_BUILD_OPENSSL_COMPAT AND MATRIXSSL_HAVE_OPENSSL_COMPAT)
-    install(DIRECTORY "${MATRIXSSL_BUILD_OPENSSL_INCLUDE_DIR}/"
-        DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/openssl
-        FILES_MATCHING PATTERN "*.h")
-endif()
 install(EXPORT matrixsslTargets
     NAMESPACE MATRIXSSL::
     DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/matrixssl)

README.md

@@ -80,3 +80,12 @@ Sensitive emails can be encrypted using the public key in this directory [pgp.as
 + Example client and server code included
 + Clean, heavily commented code in portable C
 + User and developer documentation
+
+### CMake OpenSSL compatibility include layout
+
+When the reduced OpenSSL compatibility layer is enabled, its headers are exported
+inside the MatrixSSL include root. With the default include directory this means
+`matrixssl/openssl/*.h`; with `-DMATRIXSSL_LIBRARY_PREFIX=nw` this becomes
+`nwmatrixssl/openssl/*.h`. Consumers may add the MatrixSSL include root itself
+and still include compatibility headers as `<openssl/ssl.h>`, without installing
+a top-level `include/openssl` directory that could conflict with system OpenSSL.