Configure does not use the compiler set for R consistently

[barracuda156]

* installing *source* package ‘qtbase’ ...
** using staged installation
** libs
mkdir -p ../tools/kdebindings-build;
cd ../tools/kdebindings-build; \
	cmake ../kdebindings -DR_CXX="/opt/local/bin/g++-mp-12" -DCMAKE_CXX_FLAGS="-std=gnu++17 -pipe -Os -arch ppc" -DCMAKE_SHARED_LINKER_FLAGS="-std=gnu++17  -Wl,-headerpad_max_install_names -Wl,-rpath,/opt/local/lib/libgcc -L/opt/local/lib -lMacportsLegacySupport -arch ppc -dynamiclib -Wl,-headerpad_max_install_names -undefined dynamic_lookup -single_module -multiply_defined suppress" \
	      -DCMAKE_INSTALL_PREFIX=../../inst/local \
	      -DCMAKE_EXE_LINKER_FLAGS="-std=gnu++17  -Wl,-headerpad_max_install_names -Wl,-rpath,/opt/local/lib/libgcc -L/opt/local/lib -lMacportsLegacySupport -arch ppc" \
	      -DCMAKE_MODULE_LINKER_FLAGS="-std=gnu++17  -Wl,-headerpad_max_install_names -Wl,-rpath,/opt/local/lib/libgcc -L/opt/local/lib -lMacportsLegacySupport -arch ppc"; \
	LD_LIBRARY_PATH=../../generator/bin make install
CMake Deprecation Warning at CMakeLists.txt:1 (cmake_minimum_required):
  Compatibility with CMake < 2.8.12 will be removed from a future version of
  CMake.

  Update the VERSION argument <min> value or use a ...<max> suffix to tell
  CMake that the project does not need compatibility with older versions.


-- The C compiler identification is GNU 4.2.1
-- The CXX compiler identification is GNU 12.3.0
-- Checking whether C compiler has -isysroot
-- Checking whether C compiler has -isysroot - yes
-- Checking whether C compiler supports OSX deployment target flag
-- Checking whether C compiler supports OSX deployment target flag - yes
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: /Developer/usr/bin/cc - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- Checking whether CXX compiler has -isysroot
-- Checking whether CXX compiler has -isysroot - yes
-- Checking whether CXX compiler supports OSX deployment target flag
-- Checking whether CXX compiler supports OSX deployment target flag - yes
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: /opt/local/bin/g++-mp-12 - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Looking for Q_WS_X11
-- Looking for Q_WS_X11 - not found
-- Looking for Q_WS_WIN
-- Looking for Q_WS_WIN - not found
-- Looking for Q_WS_QWS
-- Looking for Q_WS_QWS - not found
-- Looking for Q_WS_MAC
-- Looking for Q_WS_MAC - found
-- Looking for QT_MAC_USE_COCOA
-- Looking for QT_MAC_USE_COCOA - not found
-- Found Qt4: /opt/local/libexec/qt4/bin/qmake (found suitable version "4.8.7", minimum required is "4.0.0") 
-- Found Qt4: /opt/local/libexec/qt4/bin/qmake (found suitable version "4.8.7", minimum required is "4.0.0") 
-- Found OpenGL: /Developer/SDKs/MacOSX10.6.sdk/System/Library/Frameworks/OpenGL.framework   
-- Found Perl: /opt/local/bin/perl (found version "5.34.1") 
-- Checking how Qt was built...
-- Threshold is set to 15
-- QT_NO_DEBUG *Undefined*
-- QT_NO_ACCESSIBILITY *Undefined*
-- QT_NO_STYLE_PLASTIQUE *Undefined*
-- QT_NO_STYLE_WINDOWSXP [Defined]
-- QT_NO_STYLE_WINDOWS *Undefined*
-- QT_NO_STYLE_MAC [Defined]
-- QT_NO_STYLE_CLEANLOOKS *Undefined*
-- QT_NO_TABLEVIEW *Undefined*
-- $<$<NOT:$<CONFIG:Debug>>:QT_NO_DEBUG> [Defined]
-- QT_OPENGL_LIB [Defined]
-- QT_DECLARATIVE_LIB [Defined]
-- QT_SCRIPT_LIB [Defined]
-- QT_SVG_LIB [Defined]
-- QT_UITOOLS_LIB [Defined]
-- QT_HELP_LIB [Defined]
-- QT_WEBKIT_LIB [Defined]
-- QT_MULTIMEDIA_LIB [Defined]
-- QT_XMLPATTERNS_LIB [Defined]
-- QT_GUI_LIB [Defined]
-- QT_TEST_LIB [Defined]
-- QT_XML_LIB [Defined]
-- QT_SQL_LIB [Defined]
-- QT_NETWORK_LIB [Defined]
-- QT_CORE_LIB [Defined]
-- Build Smoke... yes - Qt
-- Configuring done (32.9s)