--- a/gcc/Makefile.in
+++ b/gcc/Makefile.in
@@ -1075,7 +1075,8 @@ GNATMAKE = @GNATMAKE@
 # Libs needed (at present) just for jcf-dump.
 LDEXP_LIB = @LDEXP_LIB@
 
-ZSTD_LIB = @ZSTD_LIB@
+ZSTD_INC = @ZSTD_CPPFLAGS@
+ZSTD_LIB = @ZSTD_LDFLAGS@ @ZSTD_LIB@
 
 # Likewise, for use in the tools that must run on this machine
 # even if we are cross-building GCC.
@@ -2275,7 +2276,7 @@ CFLAGS-version.o += -DBASEVER=$(BASEVER_s) -DDATESTAMP=$(DATESTAMP_s) \
 version.o: $(REVISION) $(DATESTAMP) $(BASEVER) $(DEVPHASE)
 
 # lto-compress.o needs $(ZLIBINC) added to the include flags.
-CFLAGS-lto-compress.o += $(ZLIBINC)
+CFLAGS-lto-compress.o += $(ZLIBINC) $(ZSTD_INC)
 
 CFLAGS-lto-streamer-in.o += -DTARGET_MACHINE=\"$(target_noncanonical)\"
 
--- a/gcc/configure
+++ b/gcc/configure
@@ -786,6 +786,8 @@ LTLIBICONV
 LIBICONV
 ZSTD_LIB
 ZSTD_INCLUDE
+ZSTD_LDFLAGS
+ZSTD_CPPFLAGS
 DL_LIB
 LDEXP_LIB
 EXTRA_GCC_LIBS
--- a/gcc/configure.ac
+++ b/gcc/configure.ac
@@ -1339,6 +1339,8 @@ AC_SUBST(ZSTD_INCLUDE)
 AC_SUBST(ZSTD_LIB)
 ZSTD_CPPFLAGS=
 ZSTD_LDFLAGS=
+AC_SUBST(ZSTD_CPPFLAGS)
+AC_SUBST(ZSTD_LDFLAGS)
 AC_ARG_WITH(zstd,
 	[AS_HELP_STRING([--with-zstd=PATH],
 		[specify prefix directory for installed zstd library.