c++ - 编辑 R Makevars 文件以使 STAN 工作并使用 Rccp 并编译 C++

Question

是否可以更改 Makevars 文件？在 STAN 论坛上有人告诉我，我需要这样做才能使 Rccp 也能正常工作。当我尝试更改它时，我被锁定并将其保存为不同的文件名。我怎样才能覆盖这个？

更加具体：

我需要从这里更改文件：

  # clang: start
    CFLAGS=-isysroot /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk
    CCFLAGS=-isysroot /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk
    CXXFLAGS=-isysroot /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk
    CPPFLAGS=-isysroot /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk -I/usr/local/include

    SHLIB_CXXLDFLAGS+=-Wl,-rpath,${R_HOME}/lib ${R_HOME}/lib/libc++abi.1.dylib
    # clang: end

对此：

# clang: start
CFLAGS=-isysroot /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk
CCFLAGS=-isysroot /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk
CXXFLAGS=-isysroot /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk
CPPFLAGS=-isysroot /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk -I/usr/local/include

CXX14FLAGS=-isysroot /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk
CPPF14LAGS=-isysroot /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk -I/usr/local/include

SHLIB_CXXLDFLAGS+=-Wl,-rpath,${R_HOME}/lib ${R_HOME}/lib/libc++abi.1.dylib

SHLIB_CXX14LDFLAGS+=-Wl,-rpath,${R_HOME}/lib ${R_HOME}/lib/libc++abi.1.dylib
# clang: end

当我在文本编辑器中打开文件时，我在顶部看到：

当我手动编辑它时，它不会保存为原始文件名，并与此重复：