diff --git a/build-compiler-rt.sh b/build-compiler-rt.sh
index 8712f49..c83dd41 100755
--- a/build-compiler-rt.sh
+++ b/build-compiler-rt.sh
@@ -19,6 +19,9 @@ if [ -z "$PREFIX" ]; then
     echo $0 [--build-sanitizers] dest
     exit 1
 fi
+
+mkdir -p "$PREFIX"
+PREFIX="$(cd "$PREFIX" && pwd)"
 export PATH=$PREFIX/bin:$PATH
 
 : ${CORES:=$(nproc 2>/dev/null)}
diff --git a/build-libcxx.sh b/build-libcxx.sh
index 809c093..bede395 100755
--- a/build-libcxx.sh
+++ b/build-libcxx.sh
@@ -23,6 +23,10 @@ if [ -z "$PREFIX" ]; then
     echo $0 [--disable-shared] [--disable-static] dest
     exit 1
 fi
+
+mkdir -p "$PREFIX"
+PREFIX="$(cd "$PREFIX" && pwd)"
+
 export PATH=$PREFIX/bin:$PATH
 
 : ${CORES:=$(nproc 2>/dev/null)}
diff --git a/build-libssp.sh b/build-libssp.sh
index 8dea69e..71c4b2a 100755
--- a/build-libssp.sh
+++ b/build-libssp.sh
@@ -7,6 +7,8 @@ if [ $# -lt 1 ]; then
     exit 1
 fi
 PREFIX="$1"
+mkdir -p "$PREFIX"
+PREFIX="$(cd "$PREFIX" && pwd)"
 export PATH=$PREFIX/bin:$PATH
 
 : ${CORES:=$(nproc 2>/dev/null)}
diff --git a/build-llvm.sh b/build-llvm.sh
index 6ebdb1e..c755d96 100755
--- a/build-llvm.sh
+++ b/build-llvm.sh
@@ -22,6 +22,9 @@ if [ -z "$PREFIX" ]; then
     exit 1
 fi
 
+mkdir -p "$PREFIX"
+PREFIX="$(cd "$PREFIX" && pwd)"
+
 : ${CORES:=$(nproc 2>/dev/null)}
 : ${CORES:=$(sysctl -n hw.ncpu 2>/dev/null)}
 : ${CORES:=4}
diff --git a/build-mingw-w64-libraries.sh b/build-mingw-w64-libraries.sh
index f11b8af..cdd3b38 100755
--- a/build-mingw-w64-libraries.sh
+++ b/build-mingw-w64-libraries.sh
@@ -7,6 +7,8 @@ if [ $# -lt 1 ]; then
     exit 1
 fi
 PREFIX="$1"
+mkdir -p "$PREFIX"
+PREFIX="$(cd "$PREFIX" && pwd)"
 export PATH=$PREFIX/bin:$PATH
 
 : ${CORES:=$(nproc 2>/dev/null)}
diff --git a/build-mingw-w64.sh b/build-mingw-w64.sh
index 2b767ad..2fad646 100755
--- a/build-mingw-w64.sh
+++ b/build-mingw-w64.sh
@@ -14,6 +14,10 @@ if [ -z "$PREFIX" ]; then
     echo $0 [--skip-include-triplet-prefix] dest
     exit 1
 fi
+
+mkdir -p "$PREFIX"
+PREFIX="$(cd "$PREFIX" && pwd)"
+
 if [ -z "$HOST" ]; then
     # The newly built toolchain isn't crosscompiled; add it to the path.
     export PATH=$PREFIX/bin:$PATH
diff --git a/install-wrappers.sh b/install-wrappers.sh
index 81e78e7..920dc3c 100755
--- a/install-wrappers.sh
+++ b/install-wrappers.sh
@@ -7,6 +7,8 @@ if [ $# -lt 1 ]; then
     exit 1
 fi
 PREFIX="$1"
+mkdir -p "$PREFIX"
+PREFIX="$(cd "$PREFIX" && pwd)"
 
 : ${ARCHS:=${TOOLCHAIN_ARCHS-i686 x86_64 armv7 aarch64}}