diff --git a/Scripts/bootstrap.sh b/Scripts/bootstrap.sh
index fadac72a..e8b3b842 100755
--- a/Scripts/bootstrap.sh
+++ b/Scripts/bootstrap.sh
@@ -54,6 +54,7 @@ function fetch_and_build_dependencies() {
 
 function build_inspector() {
   echo -e "${BOLD}Building Inspector"
+  assert_has_npm
   CURRENT_DIR=$(pwd)
   RESOURCE_BUNDLE_DIR="$CURRENT_DIR/Resources/WebDriverAgent.bundle"
   INSPECTOR_DIR="$CURRENT_DIR/Inspector"
diff --git a/WebDriverAgentLib/Categories/XCUIDevice+FBHelpers.m b/WebDriverAgentLib/Categories/XCUIDevice+FBHelpers.m
index 253e55b7..1528fa8b 100644
--- a/WebDriverAgentLib/Categories/XCUIDevice+FBHelpers.m
+++ b/WebDriverAgentLib/Categories/XCUIDevice+FBHelpers.m
@@ -12,6 +12,7 @@
 #import <arpa/inet.h>
 #import <ifaddrs.h>
 #include <notify.h>
+#import <objc/runtime.h>
 
 #import "FBSpringboardApplication.h"
 #import "FBErrorBuilder.h"
diff --git a/WebDriverAgentLib/Categories/XCUIElement+FBUtilities.h b/WebDriverAgentLib/Categories/XCUIElement+FBUtilities.h
index c0739e97..1526f901 100644
--- a/WebDriverAgentLib/Categories/XCUIElement+FBUtilities.h
+++ b/WebDriverAgentLib/Categories/XCUIElement+FBUtilities.h
@@ -34,16 +34,16 @@ NS_ASSUME_NONNULL_BEGIN
 - (BOOL)fb_obstructsElement:(XCUIElement *)element;
 
 /**
- Gets the most recent snapshot of the current element. The element will be 
+ Gets the most recent snapshot of the current element. The element will be
  automatically resolved if the snapshot is not available yet
- 
+
  @return The recent snapshot of the element
  */
 - (XCElementSnapshot *)fb_lastSnapshot;
 
 /**
  Filters elements by matching them to snapshots from the corresponding array
- 
+
  @param snapshots Array of snapshots to be matched with
 
  @return Array of filtered elements, which have matches in snapshots array
diff --git a/WebDriverAgentLib/Categories/XCUIElement+FBUtilities.m b/WebDriverAgentLib/Categories/XCUIElement+FBUtilities.m
index 2f24679c..9fde69dd 100644
--- a/WebDriverAgentLib/Categories/XCUIElement+FBUtilities.m
+++ b/WebDriverAgentLib/Categories/XCUIElement+FBUtilities.m
@@ -9,6 +9,8 @@
 
 #import "XCUIElement+FBUtilities.h"
 
+#import <objc/runtime.h>
+
 #import "FBAlert.h"
 #import "FBLogger.h"
 #import "FBMacros.h"
@@ -19,6 +21,7 @@
 #import "XCAXClient_iOS.h"
 #import "XCUIElement+FBWebDriverAttributes.h"
 
+
 @implementation XCUIElement (FBUtilities)
 
 static const NSTimeInterval FBANIMATION_TIMEOUT = 5.0;
@@ -124,7 +127,7 @@ - (BOOL)fb_waitUntilSnapshotIsStable
   return result;
 }
 
-- (NSData *)fb_screenshotWithError:(NSError**)error
+- (NSData *)fb_screenshotWithError:(NSError **)error
 {
   if (CGRectIsEmpty(self.frame)) {
     if (error) {
@@ -132,7 +135,7 @@ - (NSData *)fb_screenshotWithError:(NSError**)error
     }
     return nil;
   }
-  
+
   Class xcScreenClass = NSClassFromString(@"XCUIScreen");
   if (nil == xcScreenClass) {
     if (error) {
@@ -140,7 +143,7 @@ - (NSData *)fb_screenshotWithError:(NSError**)error
     }
     return nil;
   }
-  
+
   id mainScreen = [xcScreenClass valueForKey:@"mainScreen"];
   SEL mSelector = NSSelectorFromString(@"screenshotDataForQuality:rect:error:");
   NSMethodSignature *mSignature = [mainScreen methodSignatureForSelector:mSelector];
@@ -158,7 +161,7 @@ - (NSData *)fb_screenshotWithError:(NSError**)error
   if (nil == imageData) {
     return nil;
   }
-  
+
   UIImage *image = [UIImage imageWithData:imageData];
   UIInterfaceOrientation orientation = self.application.interfaceOrientation;
   UIImageOrientation imageOrientation = UIImageOrientationUp;
@@ -173,9 +176,9 @@ - (NSData *)fb_screenshotWithError:(NSError**)error
   CGSize size = image.size;
   UIGraphicsBeginImageContext(CGSizeMake(size.width, size.height));
   [[UIImage imageWithCGImage:(CGImageRef)[image CGImage] scale:1.0 orientation:imageOrientation] drawInRect:CGRectMake(0, 0, size.width, size.height)];
-  UIImage* fixedImage = UIGraphicsGetImageFromCurrentImageContext();
+  UIImage *fixedImage = UIGraphicsGetImageFromCurrentImageContext();
   UIGraphicsEndImageContext();
-  
+
   // The resulting data is a JPEG image, so we need to convert it to PNG representation
   return (NSData *)UIImagePNGRepresentation(fixedImage);
 }
diff --git a/WebDriverAgentLib/Utilities/FBXCodeCompatibility.m b/WebDriverAgentLib/Utilities/FBXCodeCompatibility.m
index 1d453565..fa012281 100644
--- a/WebDriverAgentLib/Utilities/FBXCodeCompatibility.m
+++ b/WebDriverAgentLib/Utilities/FBXCodeCompatibility.m
@@ -71,6 +71,7 @@ - (BOOL)fb_isActivateSupported
 
 @end
 
+
 static BOOL FBShouldUseFirstMatchSelector = NO;
 static dispatch_once_t onceFirstMatchToken;
 @implementation XCUIElementQuery (FBCompatibility)
diff --git a/WebDriverAgentLib/Utilities/XCTestPrivateSymbols.m b/WebDriverAgentLib/Utilities/XCTestPrivateSymbols.m
index d14b20a8..508fc0f1 100644
--- a/WebDriverAgentLib/Utilities/XCTestPrivateSymbols.m
+++ b/WebDriverAgentLib/Utilities/XCTestPrivateSymbols.m
@@ -9,6 +9,8 @@
 
 #import "XCTestPrivateSymbols.h"
 
+#import <objc/runtime.h>
+
 #import "FBRuntimeUtils.h"
 
 NSNumber *FB_XCAXAIsVisibleAttribute;
@@ -38,7 +40,7 @@
 
 void *FBRetrieveXCTestSymbol(const char *name)
 {
-  Class XCTestClass = NSClassFromString(@"XCTestCase");
+  Class XCTestClass = objc_lookUpClass("XCTestCase");
   NSCAssert(XCTestClass != nil, @"XCTest should be already linked", XCTestClass);
   NSString *XCTestBinary = [NSBundle bundleForClass:XCTestClass].executablePath;
   const char *binaryPath = XCTestBinary.UTF8String;