diff --git a/src/external/Nonlocal/PNL_PippardFitter.h b/src/external/Nonlocal/PNL_PippardFitter.h
index dc1a11e9..1cd6b619 100644
--- a/src/external/Nonlocal/PNL_PippardFitter.h
+++ b/src/external/Nonlocal/PNL_PippardFitter.h
@@ -32,6 +32,10 @@
 #ifndef _PNL_PIPPARDFITTER_H_
 #define _PNL_PIPPARDFITTER_H_
 
+// the following ifdef is needed for GCC 4.6 or higher, fftw 3.3 or higher and root 5.30.03 or lower
+#ifdef __CINT__
+typedef struct { char a[7]; } __float128; // needed since cint doesn't know it
+#endif
 #include <fftw3.h>
 
 #include "PUserFcnBase.h"
diff --git a/src/external/libFitPofB/include/TBulkTriVortexFieldCalc.h b/src/external/libFitPofB/include/TBulkTriVortexFieldCalc.h
index 63d488e5..2a2bd17d 100644
--- a/src/external/libFitPofB/include/TBulkTriVortexFieldCalc.h
+++ b/src/external/libFitPofB/include/TBulkTriVortexFieldCalc.h
@@ -35,6 +35,10 @@
 #include <string>
 using namespace std;
 
+// the following ifdef is needed for GCC 4.6 or higher, fftw 3.3 or higher and root 5.30.03 or lower
+#ifdef __CINT__
+typedef struct { char a[7]; } __float128; // needed since cint doesn't know it
+#endif
 #include "fftw3.h"
 
 /**
diff --git a/src/external/libFitPofB/include/TFilmTriVortexFieldCalc.h b/src/external/libFitPofB/include/TFilmTriVortexFieldCalc.h
index d6f8e922..70f46d3a 100644
--- a/src/external/libFitPofB/include/TFilmTriVortexFieldCalc.h
+++ b/src/external/libFitPofB/include/TFilmTriVortexFieldCalc.h
@@ -36,6 +36,10 @@
 #include <string>
 using namespace std;
 
+// the following ifdef is needed for GCC 4.6 or higher, fftw 3.3 or higher and root 5.30.03 or lower
+#ifdef __CINT__
+typedef struct { char a[7]; } __float128; // needed since cint doesn't know it
+#endif
 #include "fftw3.h"
 
 //--------------------
diff --git a/src/external/libFitPofB/include/TPofTCalc.h b/src/external/libFitPofB/include/TPofTCalc.h
index 3988aefd..f6e6894c 100644
--- a/src/external/libFitPofB/include/TPofTCalc.h
+++ b/src/external/libFitPofB/include/TPofTCalc.h
@@ -32,6 +32,11 @@
 #define _TPofTCalc_H_
 
 #include "TPofBCalc.h"
+
+// the following ifdef is needed for GCC 4.6 or higher, fftw 3.3 or higher and root 5.30.03 or lower
+#ifdef __CINT__
+typedef struct { char a[7]; } __float128; // needed since cint doesn't know it
+#endif
 #include "fftw3.h"
 #include <string>
 
diff --git a/src/external/libLFRelaxation/TLFRelaxation.h b/src/external/libLFRelaxation/TLFRelaxation.h
index bf2370c0..abb6b34e 100644
--- a/src/external/libLFRelaxation/TLFRelaxation.h
+++ b/src/external/libLFRelaxation/TLFRelaxation.h
@@ -39,6 +39,11 @@
 using namespace std;
 
 #include "PUserFcnBase.h"
+
+// the following ifdef is needed for GCC 4.6 or higher, fftw 3.3 or higher and root 5.30.03 or lower
+#ifdef __CINT__
+typedef struct { char a[7]; } __float128; // needed since cint doesn't know it
+#endif
 #include "fftw3.h"
 #include "BMWIntegrator.h"