diff --git a/src/Makevars.in b/src/Makevars.in
index be8445f..7cb6c9e 100644
--- a/src/Makevars.in
+++ b/src/Makevars.in
@@ -60,7 +60,13 @@ else
 	endif
 
 	ifeq ($(UNAME), Linux)
-		USE_TBB=Linux
+		# bincraft patch: link the system oneTBB (installed in the build-env images)
+		# instead of building the bundled Intel TBB, which fails on musl (Alpine) and
+		# newer toolchains (g++ 15). Leaving USE_TBB unset skips the bundled build;
+		# -DRCPP_PARALLEL_USE_TBB=1 keeps the TBB backend so dependents (rstan, ...)
+		# link TBB, and -ltbb/-ltbbmalloc pull the system library from default paths.
+		PKG_CXXFLAGS += -DRCPP_PARALLEL_USE_TBB=1 -DTBB_SUPPRESS_DEPRECATED_MESSAGES=1 -DTBB_INTERFACE_NEW
+		PKG_LIBS += -ltbb -ltbbmalloc
 	endif
 
 	ifeq ($(UNAME), SunOS)