diff --git a/ports/bochs/port.script b/ports/bochs/port.script
new file mode 100644
index 0000000..488c656
--- /dev/null
+++ b/ports/bochs/port.script
@@ -0,0 +1,31 @@
+#import "util/get_source.script" get_source;
+
+str targetName #option;
+str toolchainPrefix #option;
+int processorCount #option;
+
+void Start() {
+	str rootDirectory = PathGetDefaultPrefix() + "/root";
+	str version = "2.6.9";
+	if processorCount == 0 processorCount = SystemGetProcessorCount();
+	get_source.Get("https://netix.dl.sourceforge.net/project/bochs/bochs/%version%/bochs-%version%.tar.gz", "bochs-%version%",
+			"ee5b677fd9b1b9f484b5aeb4614f43df21993088c0c0571187f93acb0866e98c");
+	assert FileCopy("ports/bochs/config.cc", "bin/source/config.cc");
+	assert FileCopy("ports/bochs/config.h.in", "bin/source/config.h.in");
+	assert FileCopy("ports/bochs/configure.in", "bin/source/configure.in");
+	assert FileCopy("ports/bochs/main.cc", "bin/source/main.cc");
+	assert FileCopy("ports/bochs/Makefile.in", "bin/source/Makefile.in");
+	assert FileCopy("ports/bochs/plugin.cc", "bin/source/plugin.cc");
+	assert FileCopy("ports/bochs/plugin.h", "bin/source/plugin.h");
+	assert FileCopy("ports/bochs/essence.cc", "bin/source/gui/essence.cc");
+	assert FileCopy("ports/bochs/gui_Makefile.in", "bin/source/gui/Makefile.in");
+	assert SystemShellExecuteWithWorkingDirectory("bin/source", "autoconf");
+	assert SystemShellExecuteWithWorkingDirectory("bin/source", 
+			"./configure --with-essence CC=%toolchainPrefix%-gcc CXX=%toolchainPrefix%-g++ "
+			+ "CFLAGS=\" -O2 -D_GNU_SOURCE \" CXXFLAGS=\" -O2 -D_GNU_SOURCE \" "
+			+ "--host=%toolchainPrefix% --prefix=\"/Applications/POSIX\" --exec-prefix=\"/Applications/POSIX\" "
+			+ "--enable-cpu-level=6 --enable-x86-64 --enable-all-optimizations");
+	assert SystemShellExecuteWithWorkingDirectory("bin/source", "make -j %processorCount%");
+	assert SystemShellExecuteWithWorkingDirectory("bin/source", "make DESTDIR=%rootDirectory% install");
+	PathDeleteRecursively("bin/source");
+}
diff --git a/ports/bochs/port.sh b/ports/bochs/port.sh
deleted file mode 100755
index 6fddced..0000000
--- a/ports/bochs/port.sh
+++ /dev/null
@@ -1,27 +0,0 @@
-set -e
-
-SYSROOT=`realpath root`
-VERSION=2.6.9
-
-bin/script util/get_source.script checksum=ee5b677fd9b1b9f484b5aeb4614f43df21993088c0c0571187f93acb0866e98c directoryName=bochs-$VERSION url=https://netix.dl.sourceforge.net/project/bochs/bochs/$VERSION/bochs-$VERSION.tar.gz
-cd bin/source
-
-cp ../../ports/bochs/config.cc .
-cp ../../ports/bochs/config.h.in .
-cp ../../ports/bochs/configure.in .
-cp ../../ports/bochs/main.cc .
-cp ../../ports/bochs/Makefile.in .
-cp ../../ports/bochs/plugin.cc .
-cp ../../ports/bochs/plugin.h .
-cp ../../ports/bochs/essence.cc gui
-cp ../../ports/bochs/gui_Makefile.in gui/Makefile.in
-
-autoconf
-./configure --with-essence CC=x86_64-essence-gcc CXX=x86_64-essence-g++ CFLAGS=" -O2 -D _GNU_SOURCE " CXXFLAGS=" -O2 -D _GNU_SOURCE " --host=x86_64-essence --prefix=/Applications/POSIX --exec-prefix=/Applications/POSIX --enable-cpu-level=6 --enable-x86-64 --enable-all-optimizations
-# ./configure --with-essence CC=x86_64-essence-gcc CXX=x86_64-essence-g++ CFLAGS=" -g -D _GNU_SOURCE " CXXFLAGS=" -g -D _GNU_SOURCE " --host=x86_64-essence --prefix=/Applications/POSIX --exec-prefix=/Applications/POSIX --enable-cpu-level=6 --enable-x86-64 
-make -j 4
-make DESTDIR=$SYSROOT install
-echo Built Bochs without error.
-
-cd ../..
-rm -r bin/source
diff --git a/ports/busybox/port.script b/ports/busybox/port.script
new file mode 100644
index 0000000..9c51449
--- /dev/null
+++ b/ports/busybox/port.script
@@ -0,0 +1,25 @@
+#import "util/get_source.script" get_source;
+
+str targetName #option;
+str toolchainPrefix #option;
+int processorCount #option;
+
+void Start() {
+	str rootDirectory = PathGetDefaultPrefix() + "/root";
+	str version = "1.33.1";
+	if processorCount == 0 processorCount = SystemGetProcessorCount();
+
+	if StringTrim(SystemShellEvaluate("uname")) == "Darwin" {
+		SystemSetEnvironmentVariable("PATH", "/usr/local/opt/gnu-sed/libexec/gnubin:" + SystemGetEnvironmentVariable("PATH"));
+	}
+
+	get_source.Get("https://www.busybox.net/downloads/busybox-%version%.tar.bz2", "busybox-%version%",
+			"12cec6bd2b16d8a9446dd16130f2b92982f1819f6e1c5f5887b6db03f5660d28");
+	assert FileCopy("ports/busybox/config", "bin/source/.config");
+	assert SystemShellExecuteWithWorkingDirectory("bin/source", "sed -i \"51 i CONFIG_SYSROOT=\\\"%rootDirectory%\\\"\" .config");
+	assert SystemShellExecuteWithWorkingDirectory("bin/source", "make -j %processorCount%");
+	assert FileCopy("bin/source/busybox", "%rootDirectory%/Applications/POSIX/bin/busybox");
+	assert FileCopy("bin/source/LICENSE", "bin/BusyBox License.txt");
+
+	PathDeleteRecursively("bin/source");
+}
diff --git a/ports/busybox/port.sh b/ports/busybox/port.sh
deleted file mode 100755
index 851fe39..0000000
--- a/ports/busybox/port.sh
+++ /dev/null
@@ -1,17 +0,0 @@
-set -e
-
-SYSROOT=`realpath root`
-VERSION=1.33.1
-
-uname -a | grep Darwin && PATH="/usr/local/opt/gnu-sed/libexec/gnubin:$PATH"
-
-bin/script util/get_source.script checksum=12cec6bd2b16d8a9446dd16130f2b92982f1819f6e1c5f5887b6db03f5660d28 directoryName=busybox-$VERSION url=https://www.busybox.net/downloads/busybox-$VERSION.tar.bz2
-cd bin/source
-cp ../../ports/busybox/config .config
-sed -i "51 i CONFIG_SYSROOT=\"$SYSROOT\"" .config
-
-make -j `nproc`
-cp busybox $SYSROOT/Applications/POSIX/bin
-cp LICENSE ../BusyBox\ License.txt
-cd ../..
-rm -r bin/source
diff --git a/ports/gcc/port.script b/ports/gcc/port.script
index 513ad18..a226eed 100644
--- a/ports/gcc/port.script
+++ b/ports/gcc/port.script
@@ -22,6 +22,9 @@ bool ConsoleGetYes() {
 }
 
 void Start() {
+	assert targetName      != "";
+	assert toolchainPrefix != "";
+
 	if buildCross {
 		// Print instructions.
 		PrintStdErr("To build Essence, you need a cross compiler. This will be built for you automatically.\n");
@@ -44,8 +47,6 @@ void Start() {
 	if gmpVersion      == "" gmpVersion      = "6.2.1";
 	if mpfrVersion     == "" mpfrVersion     = "4.1.0";
 	if mpcVersion      == "" mpcVersion      = "1.2.1";
-	if targetName      == "" targetName      = "x86_64";
-	if toolchainPrefix == "" toolchainPrefix = "x86_64-essence";
 
 	// Get the number of processors to compile with.
 	if processorCount == 0 {
diff --git a/util/build.c b/util/build.c
index 1db36b9..9d09c54 100644
--- a/util/build.c
+++ b/util/build.c
@@ -1139,7 +1139,7 @@ void DoCommand(const char *l) {
 		LoadOptions();
 		Compile(COMPILE_FOR_EMULATOR, atoi(GetOptionString("Emulator.PrimaryDriveMB")), NULL);
 	} else if (0 == strcmp(l, "build-cross")) {
-		CallSystem("bin/script ports/gcc/port.script buildCross=true");
+		CallSystem("bin/script ports/gcc/port.script buildCross=true targetName=" TARGET_NAME " toolchainPrefix=" TOOLCHAIN_PREFIX);
 		printf("Please restart the build system.\n");
 		exit(0);
 	} else if (0 == strcmp(l, "build-utilities") || 0 == strcmp(l, "u")) {
@@ -1319,7 +1319,7 @@ void DoCommand(const char *l) {
 			fprintf(stderr, "build-optional-ports: Calling \"ports/%s/port.sh\"...\n", entry->d_name);
 			CallSystemF("ports/%s/port.sh", entry->d_name);
 			fprintf(stderr, "build-optional-ports: Calling \"bin/script ports/%s/port.script\"...\n", entry->d_name);
-			CallSystemF("bin/script ports/%s/port.script", entry->d_name);
+			CallSystemF("bin/script ports/%s/port.script targetName=" TARGET_NAME " toolchainPrefix=" TOOLCHAIN_PREFIX, entry->d_name);
 		}
 
 		closedir(directory);
@@ -1477,7 +1477,7 @@ void DoCommand(const char *l) {
 
 		int status; 
 		if (f) status = CallSystemF("ports/%s/port.sh", l2);
-		else status = CallSystemF("bin/script ports/%s/port.script", l2);
+		else status = CallSystemF("bin/script ports/%s/port.script targetName=" TARGET_NAME " toolchainPrefix=" TOOLCHAIN_PREFIX, l2);
 
 		if (!alreadyNamedPort) {
 			free(l2);
@@ -1544,9 +1544,9 @@ void DoCommand(const char *l) {
 		AddCompilerToPath();
 #else
 		if (automatedBuild) {
-			CallSystem("bin/script ports/gcc/port.script buildCross=true skipYesChecks=true");
+			CallSystem("bin/script ports/gcc/port.script buildCross=true skipYesChecks=true targetName=" TARGET_NAME " toolchainPrefix=" TOOLCHAIN_PREFIX);
 		} else {
-			CallSystem("bin/script ports/gcc/port.script buildCross=true");
+			CallSystem("bin/script ports/gcc/port.script buildCross=true targetName=" TARGET_NAME " toolchainPrefix=" TOOLCHAIN_PREFIX);
 		}
 
 		exit(0);