1 files changed, 5 insertions, 2 deletions

diff --git a/tools/build/Makefile b/tools/build/Makefile
index 48e62e6561b7..effe8b9cb31d 100644
--- a/tools/build/Makefile
+++ b/tools/build/Makefile
@@ -158,6 +158,9 @@ INCS+=	 ${SRCTOP}/include/getopt.h
 # getcap.c is needed for cap_mkdb:
 .PATH: ${LIBC_SRCTOP}/gen
 SRCS+=	getcap.c
+# Glibc does not provide all err*/warn* functions, and for macOS we need the
+# alias with the extra underscore.
+SRCS+=	err.c
 # Add various libbc functions that are not available in glibc:
 SRCS+=	stringlist.c setmode.c
 SRCS+=	strtonum.c merge.c heapsort.c reallocf.c
@@ -172,8 +175,8 @@ SRCS+=	strlcpy.c strlcat.c strmode.c
 SRCS+=	fgetln_fallback.c fgetwln_fallback.c closefrom.c
 CFLAGS.closefrom.c+=	-DSTDC_HEADERS -DHAVE_SYS_DIR_H -DHAVE_DIRENT_H \
 	-DHAVE_DIRFD -DHAVE_SYSCONF
-# Provide warnc/errc/getprogname/setprograme
-SRCS+=	err.c progname.c
+# Provide getprogname/setprograme
+SRCS+=	progname.c
 # Stub implementations of fflagstostr/strtofflags
 SRCS+=	fflags.c
 .endif