diff --git a/ci/run.sh b/ci/run.sh
index d130df03ae18..c30c77fdffaa 100755
--- a/ci/run.sh
+++ b/ci/run.sh
@@ -61,7 +61,12 @@ build() {
     if [ "$OS_NAME" != "windows" ]; then
         source ~/dlang/*/activate # activate host compiler, incl. setting `DMD`
     fi
-    $DMD compiler/src/build.d -ofgenerated/build
+    BUILD_DFLAGS=
+    if [ "$OS_NAME" == "osx" ]; then
+        BUILD_DFLAGS="-L-ld_classic"
+        CI_DFLAGS="$CI_DFLAGS $BUILD_DFLAGS"
+    fi
+    $DMD compiler/src/build.d -ofgenerated/build $BUILD_DFLAGS
     generated/build -j$N MODEL=$MODEL HOST_DMD=$DMD DFLAGS="$CI_DFLAGS" BUILD=debug unittest
     generated/build -j$N MODEL=$MODEL HOST_DMD=$DMD DFLAGS="$CI_DFLAGS" ENABLE_RELEASE=1 dmd
     make -j$N -C druntime MODEL=$MODEL
diff --git a/compiler/src/build.d b/compiler/src/build.d
index 8e9ccd4dfa85..fe708cbc2ca2 100755
--- a/compiler/src/build.d
+++ b/compiler/src/build.d
@@ -1002,6 +1002,9 @@ alias toolchainInfo = makeRule!((builder, rule) => builder
 
         app.put("==== Toolchain Information ====\n");
 
+        version (OSX)
+            show("OS", ["sw_vers"]);
+
         version (Windows)
             show("SYSTEM", ["systeminfo"]);
         else
diff --git a/compiler/src/dmd/backend/machobj.d b/compiler/src/dmd/backend/machobj.d
index 305c91991ff1..8308adccad85 100644
--- a/compiler/src/dmd/backend/machobj.d
+++ b/compiler/src/dmd/backend/machobj.d
@@ -1426,6 +1426,7 @@ void MachObj_term(const(char)* objfilename)
             sym32.n_sect = sym.n_sect;
             fobjbuf.write(&sym32, sym32.sizeof);
         }
+        dysymtab_cmd.nundefsym++;
         symtab_cmd.nsyms++;
     }
     foffset += symtab_cmd.nsyms * (I64 ? nlist_64.sizeof : nlist.sizeof);