diff --git a/build.sh b/build.sh
index 1f3855d..d650d52 100755
--- a/build.sh
+++ b/build.sh
@@ -1,5 +1,8 @@
 #! /usr/bin/env bash
 
+# Avoid rebuilds of the same version
+[[ ! -d build ]] && exit 0
+
 source util.sh
 cd build
 
diff --git a/configure.sh b/configure.sh
index 027b21d..1aeaceb 100755
--- a/configure.sh
+++ b/configure.sh
@@ -3,9 +3,22 @@
 source util.sh
 
 VERSION=$1
+PREFIX="$2"
 URL="https://ftp.gnu.org/gnu/gcc/gcc-$VERSION/gcc-$VERSION.tar.xz"
 ARCHIVE=$(basename "$URL")
 
+# Avoid rebuilds of the same version
+
+existing_gcc="$PREFIX/bin/sh-elf-gcc"
+
+if [[ -f "$existing_gcc" ]]; then
+  existing_version=$(sh-elf-gcc --version | head -n 1 | grep -Eo '[0-9.]+$')
+  if [[ $existing_version == $VERSION ]]; then
+    echo "$TAG Version $VERSION already installed, skipping rebuild"
+    exit 0
+  fi
+fi
+
 # Download archive
 
 if [[ -f "$ARCHIVE" ]]; then
diff --git a/giteapc.make b/giteapc.make
index e156289..d293f94 100644
--- a/giteapc.make
+++ b/giteapc.make
@@ -9,7 +9,7 @@ include giteapc-config-$(GITEAPC_CONFIG).make
 endif
 
 configure:
-	@ ./configure.sh $(VERSION)
+	@ ./configure.sh $(VERSION) "$(PREFIX)"
 
 build:
 	@ ./build.sh
diff --git a/install.sh b/install.sh
index 5b89e3d..4600bb9 100755
--- a/install.sh
+++ b/install.sh
@@ -1,5 +1,8 @@
 #! /usr/bin/env bash
 
+# Avoid rebuilds of the same version
+[[ ! -d build ]] && exit 0
+
 source util.sh
 PREFIX="$1"