diff --git a/desktop/api.cpp b/desktop/api.cpp
index 4e03a41..57d948a 100644
--- a/desktop/api.cpp
+++ b/desktop/api.cpp
@@ -2183,3 +2183,20 @@ EsProcessStartupInformation *ProcessGetStartupInformation() {
 	return api.startupInformation;
 }
 #endif
+
+#ifndef USE_STB_SPRINTF
+int EsCRTvsnprintf(char *, size_t, const char *, va_list) {
+	EsUnimplemented();
+	return 0;
+}
+
+int EsCRTsnprintf(char *, size_t, const char *, ...) {
+	EsUnimplemented();
+	return 0;
+}
+
+int EsCRTsprintf(char *, const char *, ...) {
+	EsUnimplemented();
+	return 0;
+}
+#endif
diff --git a/help/Build System.md b/help/Build System.md
index 30ea730..9ac0ada 100644
--- a/help/Build System.md	
+++ b/help/Build System.md	
@@ -216,13 +216,15 @@ Options starting with `Driver.` are used to enable and disable drivers. The defa
 
 ### Dependency options
 
-TODO
+You can disable optional dependencies using these options.
 
-- `Dependency.ACPICA`
-- `Dependency.stb_image`
-- `Dependency.stb_image_write`
-- `Dependency.stb_sprintf`
-- `Dependency.FreeTypeAndHarfBuzz`
+- `Dependency.ACPICA` ACPICA is a kernel driver that provides power management through ACPI. Without it, the system will not be able to turn off the computer or provide thermal management.
+- `Dependency.stb_image` stb\_image provides loading images of various formats. Without it, the system will only be able to load PNG images.
+- `Dependency.stb_image_write` stb\_image\_write provides writing images of various formats. Without it, the system will not be able to save images. Note that the `Image Editor` application includes this library regardless of this setting.
+- `Dependency.stb_sprintf` stb\_sprintf provides the printf-like API calls. Without it, these calls will be redirected to `EsUnimplemented`. Other optional dependencies may require this to be enabled.
+- `Dependency.FreeTypeAndHarfBuzz` FreeType and HarfBuzz provide support for TrueType font rendering. Without it, the system will only be able to load bitmap fonts.
+
+Additionally, there is the MD4C library which is included by the `Markdown Viewer` application.
 
 ## a2l
 
diff --git a/res/Fonts/Bitmap Sans Bold 9.font b/res/Fonts/Bitmap Sans Bold 9.font
index f9c3c19..6caa8b7 100644
Binary files a/res/Fonts/Bitmap Sans Bold 9.font and b/res/Fonts/Bitmap Sans Bold 9.font differ
diff --git a/res/Fonts/Bitmap Sans Regular 9.font b/res/Fonts/Bitmap Sans Regular 9.font
index fc14672..2def566 100644
Binary files a/res/Fonts/Bitmap Sans Regular 9.font and b/res/Fonts/Bitmap Sans Regular 9.font differ
diff --git a/util/build.c b/util/build.c
index 580e186..cbe96c8 100644
--- a/util/build.c
+++ b/util/build.c
@@ -72,7 +72,7 @@ BuildFont fonts[] = {
 		{ "2i", "Inter Extra Light Italic.otf" },
 		{ "3", "Inter Light.otf" },
 		{ "3i", "Inter Light Italic.otf" },
-		{ "4", "Inter Regular.otf", .required = true },
+		{ "4", "Inter Regular.otf" },
 		{ "4i", "Inter Regular Italic.otf" },
 		{ "5", "Inter Medium.otf" },
 		{ "5i", "Inter Medium Italic.otf" },
@@ -88,7 +88,7 @@ BuildFont fonts[] = {
 	} },
 
 	{ "Hack", "Hack License.md", "Mono", "Latn,Grek,Cyrl", (FontFile []) {
-		{ "4", "Hack Regular.ttf", .required = true },
+		{ "4", "Hack Regular.ttf" },
 		{ "4i", "Hack Regular Italic.ttf" },
 		{ "7", "Hack Bold.ttf" },
 		{ "7i", "Hack Bold Italic.ttf" },
@@ -112,8 +112,8 @@ BuildFont fonts[] = {
 	} },
 
 	{ "Bitmap Sans", "", "Sans", "Latn", (FontFile []) {
-		{ "4", "Bitmap Sans Regular 9.font" },
-		{ "7", "Bitmap Sans Bold 9.font" },
+		{ "4", "Bitmap Sans Regular 9.font", .required = true },
+		{ "7", "Bitmap Sans Bold 9.font", .required = true },
 		{},
 	} },