diff --git a/_tools/lib/logging.py b/_tools/lib/logging.py
index 3576f2c158..b221457211 100644
--- a/_tools/lib/logging.py
+++ b/_tools/lib/logging.py
@@ -1,4 +1,21 @@
+import shutil
+
 def log(s, end = "\n"):
     print(s, end = end, flush = True)
 
+def require_tools(names):
+    assert(type(names) == list or type(names) == tuple)
+    for name in names:
+        assert(type(name) == str)
+
+    not_found = []
+    for name in names:
+        if shutil.which(name) is None:
+            not_found.append(name)
+
+    if len(not_found) != 0:
+        log("Sorry, I can't find some tools:")
+        for name in not_found:
+            print(f"- {name}")
+        exit(1)
 
diff --git a/_tools/lib/tupfile_parser.py b/_tools/lib/tupfile_parser.py
index 0560ff306f..c960e01685 100644
--- a/_tools/lib/tupfile_parser.py
+++ b/_tools/lib/tupfile_parser.py
@@ -62,6 +62,20 @@ def parse_rule_output(src, ptr):
     # Now we can read the string
     return get_strnig(src, ptr)
 
+def parse_required_compiler(src, ptr):
+    # Get straignt to the first argument
+    ptr += len("tup.getconfig")
+    # Get to parenthese
+    ptr = get_to(src, ptr, "(")
+    # Get to start of the requirement string
+    ptr = get_to(src, ptr, "\"")
+    # Read the requirement string (like NO_FASM)
+    requirement_string = get_strnig(src, ptr)
+    if requirement_string.startswith("NO_"):
+        return requirement_string[len("NO_"):].lower().replace("_", "-")
+    else:
+        return None
+
 def parse_tupfile_outputs(file_name):
     outputs = []
     with open(file_name) as f:
@@ -72,3 +86,17 @@ def parse_tupfile_outputs(file_name):
         # Find the next tup.rule call
         rule_begin_index = tupfile.find("tup.rule(", rule_begin_index + len("tup.rule("))
     return outputs
+
+def parse_required_compilers(file_name):
+    compilers = []
+    with open(file_name) as f:
+        tupfile = f.read()
+    rule_begin_index = tupfile.find("tup.getconfig(")
+    while (rule_begin_index != -1):
+        required_compiler = parse_required_compiler(tupfile, rule_begin_index)
+        if required_compiler is not None:
+            compilers.append(required_compiler)
+        # Find the next tup.getconfig call
+        rule_begin_index = tupfile.find("tup.getconfig(", rule_begin_index + len("tup.getconfig"))
+    return compilers
+ 
diff --git a/_tools/workspace/build.py b/_tools/workspace/build.py
index d3d9b86faf..21eb87c805 100644
--- a/_tools/workspace/build.py
+++ b/_tools/workspace/build.py
@@ -5,7 +5,8 @@ path_to_tools_workspace = os.path.dirname(os.path.abspath(__file__))
 path_to_tools = os.path.dirname(path_to_tools_workspace)
 sys.path.append(path_to_tools)
 
-from lib.tupfile_parser import parse_tupfile_outputs
+from lib.tupfile_parser import parse_required_compilers, parse_tupfile_outputs
+from lib.logging import require_tools
 
 def get_executable_file(output_file_list):
     for name in output_file_list:
@@ -14,6 +15,8 @@ def get_executable_file(output_file_list):
         return name
 
 def build():
+    required_compilers = parse_required_compilers("Tupfile.lua")
+    require_tools(required_compilers)
     os.system("tup")
     output_file_list = parse_tupfile_outputs("Tupfile.lua")
     return get_executable_file(output_file_list)
diff --git a/_tools/workspace/run.py b/_tools/workspace/run.py
index 31f38ea883..1c0ab24179 100644
--- a/_tools/workspace/run.py
+++ b/_tools/workspace/run.py
@@ -14,11 +14,13 @@ from workspace.build import build
 from lib.builds import builds_get, builds_get_contents
 from lib.makeflop import Floppy
 from lib.platform import is_win32, path
-from lib.logging import log
+from lib.logging import log, require_tools
 from lib.constants import tools_cache_kolibri_img
 
 # TODO: Move into _tools/lib
 def run_qemu(start_dir = "workspace"):
+    require_tools(("qemu-system-i386",))
+
     qemu_command = f"qemu-system-i386"
     flags = ""
     flags += "-L . " # IDK why it does not work without this