diff --git a/Data/scripts.csv b/Data/scripts.csv
index b9003247..f5aacb25 100644
--- a/Data/scripts.csv
+++ b/Data/scripts.csv
@@ -1,6 +1,7 @@
 Script,Description
 add-firewall-rules.ps1, adds firewall rules to the given executables (needs admin rights)
 build-repo.ps1, builds the current/given Git repository 
+build-repos.ps1, builds all Git repositories under the current/given directory
 check-cpu-temp.ps1, checks the CPU temperature
 check-dns-resolution.ps1, checks the DNS resolution with frequently used domain names
 check-drive-space.ps1, checks the given drive for free space left
diff --git a/README.md b/README.md
index 4ccd8db2..1423a918 100644
--- a/README.md
+++ b/README.md
@@ -121,6 +121,7 @@ Mega Collection of PowerShell Scripts
 📝 PowerShell Scripts for Git
 ------------------------------
 * [build-repo.ps1](Scripts/build-repo.ps1) - builds the current/given Git repository 
+* [build-repos.ps1](Scripts/build-repos.ps1) - builds all Git repositories under the current/given directory
 * [cherry-picker.ps1](Scripts/cherry-picker.ps1) - cherry-picks a Git commit into multiple branches
 * [clean-repo.ps1](Scripts/clean-repo.ps1) - cleans the current/given Git repository from untracked files (including submodules)
 * [clone-repos.ps1](Scripts/clone-repos.ps1) - clones well-known Git repositories
diff --git a/Scripts/build-repo.ps1 b/Scripts/build-repo.ps1
index bbe65af7..382ec617 100755
--- a/Scripts/build-repo.ps1
+++ b/Scripts/build-repo.ps1
@@ -9,19 +9,24 @@
 param($RepoDir = "$PWD")
 
 try {
-	if (test-path CMakeLists.txt) { 
+	if (test-path "$Repodir/CMakeLists.txt") { 
 		"Building $RepoDir using CMakeLists.txt..."
-		& cmake .
-		if ($lastExitCode -ne "0") { throw "Can't execute 'cmake .'" }
+		& mkdir CMakeBuild
+		set-location CMakeBuild
 
-		& make
-		if ($lastExitCode -ne "0") { throw "Can't execute 'make .'" }
-	} elseif (test-path Makefile) {
+		& cmake ..
+		if ($lastExitCode -ne "0") { throw "Executing 'cmake ..' has failed" }
+
+		& make -j4
+		if ($lastExitCode -ne "0") { throw "Executing 'make -j4' has failed" }
+	} elseif (test-path "$RepoDir/Makefile") {
 		"Building $RepoDir using Makefile..."
-		& make
-		if ($lastExitCode -ne "0") { throw "Can't execute 'make .'" }
+
+		& make -j4
+		if ($lastExitCode -ne "0") { throw "Executing 'make -j4' has failed" }
 	} else {
 		write-warning "Sorry, no clue how to build $RepoDir"
+		exit 0
 	}
 	write-host -foregroundColor green "OK - built Git repository $RepoDir"
 	exit 0
diff --git a/Scripts/build-repos.ps1 b/Scripts/build-repos.ps1
new file mode 100755
index 00000000..9dacc58c
--- /dev/null
+++ b/Scripts/build-repos.ps1
@@ -0,0 +1,32 @@
+#!/usr/bin/pwsh
+<#
+.SYNTAX       build-repos.ps1 [<parent-dir>]
+.DESCRIPTION  builds all Git repositories under the current/given directory
+.LINK         https://github.com/fleschutz/PowerShell
+.NOTES        Author: Markus Fleschutz / License: CC0
+#>
+
+param($ParentDir = "$PWD")
+
+try {
+	"Building Git repositories under $($ParentDir)..."
+	$StartTime = get-date
+
+	if (-not(test-path "$ParentDir" -pathType container)) { throw "Can't access directory: $ParentDir" }
+	set-location $ParentDir
+
+	[int]$Count = 0
+	get-childItem $ParentDir -attributes Directory | foreach-object {
+		& "$PSScriptRoot/build-repo.ps1" "$ParentDir/$($_.FullName)"
+		if ($lastExitCode -ne "0") { throw "'git fetch --all --recurse-submodules' failed" }
+
+		$Count++
+	}
+
+	$Elapsed = new-timeSpan -start $StartTime -end (get-date)
+	write-host -foregroundColor green "OK - built $Count Git repositories under $ParentDir in $($Elapsed.seconds) second(s)"
+	exit 0
+} catch {
+	write-error "ERROR: line $($_.InvocationInfo.ScriptLineNumber): $($Error[0])"
+	exit 1
+}