Compile err: not declared in this scope

I'm taking a shot at my first library and I'm getting a this error

LeakSensors.cpp: In constructor 'Leaksensor::Leaksensor()':
LeakSensors.cpp:12: error: 'I2c' was not declared in this scope

I have 3 tabs in my sketch
IC2_Master_DSS_Lib.ino
LeakSensors.cpp
LeakSensor.h

All three of these files are in the \IC2_Master_DSS_Lib\ folder

My sketch also uses an I2c.h library with is in my \library\ folder

I had a working sketch with just a .ino file, no LeakSensors.cpp or LeakSensor.h at that point. In that original sketch, I just had to include the I2c.h library: #include <I2C.h>, and I could use the i2c functions in it, like I2c.begin();

But now with my three files, the IDE doesn't seem to be including the I2c.h library.

In IC2_Master_DSS_Lib.ino I have

#include "LeakSensors.h"
Leaksensor sensorInfo;  // initialize Leaksensor class
void setup () 
{
  Serial.begin(9600);
  Serial.println(F("Initialize library for I2C Master Test"));
}
...

In LeakSensors.cpp I have

#include "LeakSensors.h"
#include <I2C.h>   // https://github.com/rambo/I2C

#define PACKET_SIZE sizeof(sensorData_t)

Leaksensor::Leaksensor()   // Constructor
{
  // Initialize I2C
  I2c.begin();  // enables the I2C hardware
  I2c.timeOut(10000);
}
...

In LeakSensor.h I have

#include "Arduino.h"

class Leaksensor
{
  public:
...

There's more to each sketch then posted above (see attachments for complete code)
I've tried including I2c with double quotes instead of brackets. And I've moved it to different files, but I still get the this error.

I2C.h (4.54 KB)

I2C_Master_DSS_Lib.ino (1.2 KB)

LeakSensors.cpp (1.54 KB)

LeakSensors.h (1.13 KB)

An arduino IDE quirk requires the sketch to include all additional libraries that any library may include.

Just add #include <I2C.h> to the sketch also.

That did it, thanks!