diff --git a/pkgs/applications/misc/apvlv/default.nix b/pkgs/applications/misc/apvlv/default.nix
index f1d84a919724..e6d2ede01efd 100644
--- a/pkgs/applications/misc/apvlv/default.nix
+++ b/pkgs/applications/misc/apvlv/default.nix
@@ -58,7 +58,7 @@ stdenv.mkDerivation rec {
     '';
 
     license = licenses.lgpl2;
-    platforms = platforms.unix;
+    platforms = platforms.linux;
     maintainers = [ maintainers.ardumont ];
   };
 
diff --git a/pkgs/applications/misc/bb/default.nix b/pkgs/applications/misc/bb/default.nix
index 3d04b53dcde7..0689843af612 100644
--- a/pkgs/applications/misc/bb/default.nix
+++ b/pkgs/applications/misc/bb/default.nix
@@ -19,6 +19,6 @@ stdenv.mkDerivation rec {
     description = "AA-lib demo";
     license     = licenses.gpl2;
     maintainers = [ maintainers.rnhmjoj ];
-    platforms   = platforms.unix;
+    platforms   = platforms.linux;
   };
 }
diff --git a/pkgs/applications/misc/confclerk/default.nix b/pkgs/applications/misc/confclerk/default.nix
index de18a211c450..7781f0df853a 100644
--- a/pkgs/applications/misc/confclerk/default.nix
+++ b/pkgs/applications/misc/confclerk/default.nix
@@ -23,6 +23,6 @@ stdenv.mkDerivation {
     homepage = http://www.toastfreeware.priv.at/confclerk;
     license = stdenv.lib.licenses.gpl2;
     maintainers = with stdenv.lib.maintainers; [ ehmry ];
-    inherit (qt4.meta) platforms;
+    platforms = stdenv.lib.platforms.linux;
   };
 }
diff --git a/pkgs/applications/science/math/bcal/default.nix b/pkgs/applications/science/math/bcal/default.nix
index baede83f6514..9a0a084a1f02 100644
--- a/pkgs/applications/science/math/bcal/default.nix
+++ b/pkgs/applications/science/math/bcal/default.nix
@@ -15,7 +15,7 @@ stdenv.mkDerivation rec {
 
   nativeBuildInputs = [ python3Packages.pytest ];
 
-  doCheck = true;
+  doCheck = !stdenv.isDarwin;
   checkPhase = ''
     python3 -m pytest test.py
   '';
diff --git a/pkgs/development/libraries/cmark/default.nix b/pkgs/development/libraries/cmark/default.nix
index 5fdd1edfd972..6c73bd016031 100644
--- a/pkgs/development/libraries/cmark/default.nix
+++ b/pkgs/development/libraries/cmark/default.nix
@@ -12,7 +12,7 @@ stdenv.mkDerivation rec {
   };
 
   nativeBuildInputs = [ cmake ];
-  doCheck = true;
+  doCheck = !stdenv.isDarwin;
   checkPhase = ''
     export LD_LIBRARY_PATH=$(readlink -f ./src)
     CTEST_OUTPUT_ON_FAILURE=1 make test
diff --git a/pkgs/development/misc/avr/gcc/default.nix b/pkgs/development/misc/avr/gcc/default.nix
index 0bfa6d1f238d..8d1eb43c9343 100644
--- a/pkgs/development/misc/avr/gcc/default.nix
+++ b/pkgs/development/misc/avr/gcc/default.nix
@@ -54,7 +54,7 @@ stdenv.mkDerivation {
     description = "GNU Compiler Collection, version ${version} for AVR microcontrollers";
     homepage = http://gcc.gnu.org;
     license = licenses.gpl3Plus;
-    platforms = platforms.unix;
+    platforms = platforms.linux;
     maintainers = with maintainers; [ mguentner ];
   };
 }
diff --git a/pkgs/os-specific/darwin/apple-source-releases/shell_cmds/default.nix b/pkgs/os-specific/darwin/apple-source-releases/shell_cmds/default.nix
index f434e15794ea..4f527acc950c 100644
--- a/pkgs/os-specific/darwin/apple-source-releases/shell_cmds/default.nix
+++ b/pkgs/os-specific/darwin/apple-source-releases/shell_cmds/default.nix
@@ -10,10 +10,12 @@ appleDerivation rec {
     # - su ('security/pam_appl.h' file not found)
     # - find (Undefined symbol '_get_date')
     # - w (Undefined symbol '_res_9_init')
+    # - expr
     substituteInPlace shell_cmds.xcodeproj/project.pbxproj \
       --replace "FCBA168714A146D000AA698B /* PBXTargetDependency */," "" \
       --replace "FCBA165914A146D000AA698B /* PBXTargetDependency */," "" \
-      --replace "FCBA169514A146D000AA698B /* PBXTargetDependency */," ""
+      --replace "FCBA169514A146D000AA698B /* PBXTargetDependency */," "" \
+      --replace "FCBA165514A146D000AA698B /* PBXTargetDependency */," ""
 
     # disable w, test install
     # get rid of permission stuff
diff --git a/pkgs/tools/backup/bdsync/default.nix b/pkgs/tools/backup/bdsync/default.nix
index 8ef846a8dca3..2fd67765aaf3 100644
--- a/pkgs/tools/backup/bdsync/default.nix
+++ b/pkgs/tools/backup/bdsync/default.nix
@@ -36,7 +36,7 @@ stdenv.mkDerivation rec {
     description = "Fast block device synchronizing tool";
     homepage = https://github.com/TargetHolding/bdsync;
     license = licenses.gpl2;
-    platforms = platforms.all;
+    platforms = platforms.linux;
     maintainers = with maintainers; [ jluttine ];
   };
 
diff --git a/pkgs/tools/misc/cutecom/default.nix b/pkgs/tools/misc/cutecom/default.nix
index e3f8a4c43a59..b20e493a5855 100644
--- a/pkgs/tools/misc/cutecom/default.nix
+++ b/pkgs/tools/misc/cutecom/default.nix
@@ -20,6 +20,6 @@ stdenv.mkDerivation rec {
     homepage = http://cutecom.sourceforge.net/;
     license = stdenv.lib.licenses.gpl2Plus;
     maintainers = [ stdenv.lib.maintainers.bennofs ];
-    platforms = stdenv.lib.platforms.unix;
+    platforms = stdenv.lib.platforms.linux;
   };
 }
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index f54b163c1305..a6d76e4e6df6 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -12273,7 +12273,9 @@ with pkgs;
   knot-dns = callPackage ../servers/dns/knot-dns { };
   knot-resolver = callPackage ../servers/dns/knot-resolver {
     # TODO: vimNox after it gets fixed on Darwin or something lighter
-    hexdump = if stdenv.isLinux then utillinux.bin else vim/*xxd*/;
+    hexdump = if stdenv.isLinux then utillinux.bin
+              else if stdenv.isDarwin then darwin.shell_cmds
+              else vim/*xxd*/;
   };
 
   rdkafka = callPackage ../development/libraries/rdkafka { };
@@ -19884,7 +19886,9 @@ with pkgs;
 
   pcalc = callPackage ../applications/science/math/pcalc { };
 
-  bcal = callPackage ../applications/science/math/bcal { };
+  bcal = callPackage ../applications/science/math/bcal {
+    stdenv = gccStdenv;
+  };
 
   pspp = callPackage ../applications/science/math/pspp {
     inherit (gnome3) gtksourceview;