Don't recommend running `sudo make`. Don't install packages without permission. Don't automatically update packages.

Makefile

@@ -273,8 +273,7 @@ plugin-analyze: static-analysis-cppcheck
 
 
 dep-ubuntu:
-	apt-get update
-	apt-get install -y --no-install-recommends \
+	sudo apt-get install --no-install-recommends \
 		ca-certificates \
 		git \
 		build-essential \
@@ -314,7 +313,7 @@ dep-ubuntu:
 
 
 dep-arch-linux:
-	pacman -Suyy --noconfirm && pacman -S --noconfirm --needed \
+	sudo pacman -S --needed \
 		gcc \
 		git \
 		cmake \

README.md

@@ -38,11 +38,13 @@ There are two ways to build the toolchains:
 Install toolchain build dependencies.
 On Arch Linux,
 ```bash
-sudo make dep-arch-linux
+sudo pacman -Syu
+make dep-arch-linux
 ```
 or on Ubuntu,
 ```bash
-sudo make dep-ubuntu
+sudo apt-get update
+make dep-ubuntu
 ```
 
 Build toolchains for all three platforms.