I'm facing a build error when integrating react-native-fast-opencv into my React Native project. The issue occurs during the iOS build process in Xcode and blocks the app from compiling. The error is:

'RNFastOpencvSpec.h' file not found
In file included from ProjectRootDirectory/node_modules/react-native-fast-opencv/ios/FastOpencv.mm:1:

What I Tried:

I have tried the following steps to resolve the issue:

1. Deleted the Derived Data folder and cleaned the build folder.

2. Rebuilt the project in Xcode.

3. Deleted the node_modules folder, Pods folder, and Podfile.lock file.

4. Reinstalled dependencies by running:

   yarn install
   
   cd ios && pod install
   

5. Downgraded react-native-fast-opencv to version ^0.2.13.

6. In my ios folder i have also tried

   RCT_NEW_ARCH_ENABLED=1 bundle exec pod install

Unfortunately, none of these steps have resolved the issue.

Additional Information

Library Version: "react-native-fast-opencv": "^0.3.0"

React Native Version: "react-native": "0.76.1"

Node Version: v18.18.0

Yarn Version: 3.6.4

Xcode Version: Version 16.0

macOS Version: 15.0.1

I'm facing a build error when integrating react-native-fast-opencv into my React Native project. The issue occurs during the iOS build process in Xcode and blocks the app from compiling. The error is:

'RNFastOpencvSpec.h' file not found
In file included from ProjectRootDirectory/node_modules/react-native-fast-opencv/ios/FastOpencv.mm:1:

What I Tried:

I have tried the following steps to resolve the issue:

1. Deleted the Derived Data folder and cleaned the build folder.

2. Rebuilt the project in Xcode.

3. Deleted the node_modules folder, Pods folder, and Podfile.lock file.

4. Reinstalled dependencies by running:

   yarn install
   
   cd ios && pod install
   

5. Downgraded react-native-fast-opencv to version ^0.2.13.

6. In my ios folder i have also tried

   RCT_NEW_ARCH_ENABLED=1 bundle exec pod install

Unfortunately, none of these steps have resolved the issue.

Additional Information

Library Version: "react-native-fast-opencv": "^0.3.0"

React Native Version: "react-native": "0.76.1"

Node Version: v18.18.0

Yarn Version: 3.6.4

Xcode Version: Version 16.0

macOS Version: 15.0.1

• xcode
• react-native
• opencv

1 Answer 1

I was able to resolve the issue with the

'RNFastOpencvSpec.h' file not found

error during the iOS build process in Xcode.

The problem was related to the version (^0.3.0) of react-native-fast-opencv with react native(0.76.1).After contacting the library maintainer, they pointed out that the issue was fixed in version v0.3.1.

I updated to this newer version, and the error was resolved successfully.

Solution:

Update react-native-fast-opencv to version v0.3.1 or above. Clean and rebuild the project.

Hope this helps others encountering the same issue!