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this, or always move away the newly installed package.
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this, or always move away the newly installed package.
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Should a package require external libraries, these can be placed under
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Should a package require external libraries, these can be placed under
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LOCAL_SOFT as defined in etc/x64/Makeconf in the copy.
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LOCAL_SOFT as defined in etc/x64/Makeconf in the copy.
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Some packages use pkg-config to query C flags or libraries to link and
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unconditionally use "pkg-config" from PATH.  For such packages one has to
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arrange for "pkg-config" on PATH to call to the appropriate pkg-config
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wrapper for the target platform and toolchain.  With Rtools, it is
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"x86_64-w64-mingw32.static.posix-pkg-config".  This is not needed for
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building R itself, R uses the wrapper directly.
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When targeting aarch64 Windows, copy etc/Makeconf from the cross-build
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When targeting aarch64 Windows, copy etc/Makeconf from the cross-build
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(R_WIN) over etc/Makeconf of the linux build and edit the copy to have the
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(R_WIN) over etc/Makeconf of the linux build and edit the copy to have the
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R_XTRA_CPPFLAGS, pointing to the cross-build, as above.  Copy bin/*.dll from
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R_XTRA_CPPFLAGS, pointing to the cross-build, as above.  Copy bin/*.dll from
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the cross-build to bin/ in the linux build.  Set R_CROSS_BUILD to
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the cross-build to bin/ in the linux build.  Set R_CROSS_BUILD to
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"singlearch".
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"singlearch".