5 files changed, 13 insertions, 9 deletions
diff --git a/pkgs/applications/graphics/dia/default.nix b/pkgs/applications/graphics/dia/default.nix
index 949dce7132be..4780c823697a 100644
--- a/pkgs/applications/graphics/dia/default.nix
+++ b/pkgs/applications/graphics/dia/default.nix
@@ -24,7 +24,7 @@ stdenv.mkDerivation rec {
   preConfigure = ''
     NOCONFIGURE=1 ./autogen.sh # autoreconfHook is not enough
   '';
-  configureFlags = stdenv.lib.optionalString withGNOME "--enable-gnome";
+  configureFlags = stdenv.lib.optional withGNOME "--enable-gnome";
 
   hardeningDisable = [ "format" ];
 
diff --git a/pkgs/applications/networking/browsers/dillo/default.nix b/pkgs/applications/networking/browsers/dillo/default.nix
index 73094767bf3d..ab1e0822bf1a 100644
--- a/pkgs/applications/networking/browsers/dillo/default.nix
+++ b/pkgs/applications/networking/browsers/dillo/default.nix
@@ -17,7 +17,7 @@ stdenv.mkDerivation rec {
   buildInputs = with stdenv.lib;
   [ perl fltk openssl libjpeg libpng libXcursor libXi libXinerama ];
 
-  configureFlags =  "--enable-ssl";
+  configureFlags = [ "--enable-ssl" ];
 
   meta = with stdenv.lib; {
     homepage = https://www.dillo.org/;
diff --git a/pkgs/applications/networking/znc/default.nix b/pkgs/applications/networking/znc/default.nix
index 30fa41de12d1..ca5624d5b73f 100644
--- a/pkgs/applications/networking/znc/default.nix
+++ b/pkgs/applications/networking/znc/default.nix
@@ -24,10 +24,13 @@ stdenv.mkDerivation rec {
     ++ optional withTcl tcl
     ++ optional withCyrus cyrus_sasl;
 
-  configureFlags = optionalString withPerl "--enable-perl "
-    + optionalString withPython "--enable-python "
-    + optionalString withTcl "--enable-tcl --with-tcl=${tcl}/lib "
-    + optionalString withCyrus "--enable-cyrus ";
+  configureFlags = [
+    (stdenv.lib.enableFeature withPerl "perl")
+    (stdenv.lib.enableFeature withPython "python")
+    (stdenv.lib.enableFeature withTcl "tcl")
+    (stdenv.lib.withFeatureAs withTcl "tcl" "${tcl}/lib")
+    (stdenv.lib.enableFeature withCyrus "cyrus")
+  ];
 
   meta = with stdenv.lib; {
     description = "Advanced IRC bouncer";
diff --git a/pkgs/applications/version-management/fossil/default.nix b/pkgs/applications/version-management/fossil/default.nix
index 1373e13c4147..396ed10392ca 100644
--- a/pkgs/applications/version-management/fossil/default.nix
+++ b/pkgs/applications/version-management/fossil/default.nix
@@ -27,7 +27,7 @@ stdenv.mkDerivation rec {
   preCheck = stdenv.lib.optional doCheck ''
     export TCLLIBPATH="${tcllib}/lib/tcllib${tcllib.version}"
   '';
-  configureFlags = if withJson then  "--json" else  "";
+  configureFlags = stdenv.lib.optional withJson "--json";
 
   preBuild=''
     export USER=nonexistent-but-specified-user
diff --git a/pkgs/applications/video/xawtv/default.nix b/pkgs/applications/video/xawtv/default.nix
index 1b1bb8147d31..5bc9ad8852a1 100644
--- a/pkgs/applications/video/xawtv/default.nix
+++ b/pkgs/applications/video/xawtv/default.nix
@@ -12,8 +12,9 @@ stdenv.mkDerivation rec {
     export NIX_CFLAGS_COMPILE="$NIX_CFLAGS_COMPILE -I${linux}/lib/modules/${linux.modDirVersion}/build"
   '';
 
-  configureFlags="--prefix=";
-  NIX_LDFLAGS="-lgcc_s";
+  configureFlags= [ "--prefix=" ];
+
+  NIX_LDFLAGS = "-lgcc_s";
 
   makeFlags = "SUID_ROOT= DESTDIR=\$(out) PREFIX=";