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    <p>Hi everyone,</p>
    <p>i try to patch a file from an externalprojects with the
      PATCH_COMMAND.</p>
    <p>The patch file looks like: <br>
    </p>
    <pre>--- project-config.jam    2019-07-18 17:21:44.008695808 +0200
+++ project-config.jam.tmp    2019-07-18 17:23:28.236474532 +0200
@@ -18,7 +18,7 @@
 import python ;
 if ! [ python.configured ]
 {
-    using python : 2.7 : /usr ;
+    using python : 3.7 : /usr ;
 }
 
 path-constant ICU_PATH : /usr ;
</pre>
    <p>When i try to apply the patch manualy with patch originalfile
      < patchfile it's working, but when i try it with the
      externalproject_add command:</p>
    <pre>if(WITH_LIB_BOOST)
    message(STATUS "Build WITH_LIB_BOOST.")

    set(LIB_BOOST_INC_PATH ${OUTPUT_PATH}/libs/boost/include/)
    set(LIB_BOOST_LIB_PATH ${OUTPUT_PATH}/libs/boost/lib)
    set(LIB_BOOST_DEPS external_boost)
    set(LIB_BOOST_STATIC_LIBS boost_python27)
 
    ExternalProject_Add(external_boost
        PREFIX ${CMAKE_BINARY_DIR}/boost
        URL ${BOOST_URL}
        DOWNLOAD_DIR ${CMAKE_BINARY_DIR}/boost
        URL_HASH MD5=${BOOST_HASH}
        PATCH_COMMAND /usr/bin/patch ${CMAKE_BINARY_DIR}/boost/src/external_boost/project-config.jam < ${CMAKE_SOURCE_DIR}/tools/patches/boost_python3.7.patch
        CONFIGURE_COMMAND cd ${CMAKE_BINARY_DIR}/boost/src/external_boost/ &&
                        ./bootstrap.sh --prefix=${OUTPUT_PATH}/libs/boost/ --with-libraries=python
        BUILD_COMMAND cd ${CMAKE_BINARY_DIR}/boost/src/external_boost/ &&
                      ./b2
        INSTALL_COMMAND cd ${CMAKE_BINARY_DIR}/boost/src/external_boost/ && ./bjam && ./bjam install
        INSTALL_DIR ${OUTPUT_PATH}/boost
    )

endif()
</pre>
    <p>But when running cmake i get the following output:</p>
    <pre>patching file /home/stuv/projects/programming/bsEdit/build/boost/src/external_boost/project-config.jam</pre>
    <pre>Hunk #1 FAILED at 18.</pre>
    <p><br>
    </p>
    <p>I have no idea what i'm doing wrong here, i hope someone here can
      help me out.</p>
    <p><br>
    </p>
    <p>best regards,</p>
    <p>Steven Truppe<br>
    </p>
    <p><br>
    </p>
    <p><br>
    </p>
    <p><br>
    </p>
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