gentoo-overlay/dev-util/boost-build/files/boost-build-1.76.0-respect-user-flags.patch

--- a/engine/build.sh
+++ b/engine/build.sh
@@ -496,7 +496,7 @@
     if test_true ${B2_DEBUG_OPT} ; then B2_CXXFLAGS="${B2_CXXFLAGS_DEBUG}"
     else B2_CXXFLAGS="${B2_CXXFLAGS_RELEASE} -DNDEBUG"
     fi
-    ( B2_VERBOSE_OPT=${TRUE} echo_run ${B2_CXX} ${B2_CXXFLAGS} ${B2_SOURCES} -o b2 )
+    ( B2_VERBOSE_OPT=${TRUE} echo_run ${B2_CXX} ${CPPFLAGS} ${B2_CXXFLAGS} ${LDFLAGS} ${B2_SOURCES} -o b2 )
     ( B2_VERBOSE_OPT=${TRUE} echo_run cp b2 bjam )
 }