Index: fish/config.fish
==================================================================
--- fish/config.fish
+++ fish/config.fish
@@ -59,8 +59,10 @@
     alias gsftp="SSH_AUTH_SOCKET=$sock sftp"
 end
 
 if test (uname -s) = Darwin
     set -x MAKEFLAGS -j(math (sysctl -n machdep.cpu.thread_count)'*2')
+else if test (uname -s) = NetBSD
+    set -x MAKEFLAGS -j(math (sysctl -n hw.ncpu)'*2')
 else if type -q nproc
     set -x MAKEFLAGS -j(math (nproc)'*2')
 end

Index: zshrc
==================================================================
--- zshrc
+++ zshrc
@@ -221,10 +221,12 @@
 __has_command vim && alias vi=vim
 __has_command gpg2 && alias gpg=gpg2
 
 if [ "$(uname -s)" = "Darwin" ]; then
 	export MAKEFLAGS="-j$(($(sysctl -n machdep.cpu.thread_count) * 2))"
+elif [ "$(uname -s)" = "NetBSD"; then
+	export MAKEFLAGS="-j$(($(sysctl -n hw.ncpu) * 2))"
 elif __has_command nproc; then
 	export MAKEFLAGS="-j$(($(nproc) * 2))"
 fi
 
 make() {