diff --git a/cainlib/CMakeLists.txt b/cainlib/CMakeLists.txt
index 9307132..e569a40 100644
--- a/cainlib/CMakeLists.txt
+++ b/cainlib/CMakeLists.txt
@@ -8,6 +8,17 @@ set(CMAKE_BUILD_TYPE Release)
 
 set(CMAKE_CXX_FLAGS "-O3 -fPIC -fno-align-commons -fbounds-check -fbacktrace -ffixed-form")
 
+if(NOT DEFINED ENV{CAIN_COEF_DIR})
+    set(CAIN_COEF_DIR "${CMAKE_SOURCE_DIR}/src/")
+else()
+    set(CAIN_COEF_DIR "$ENV{CAIN_COEF_DIR}")
+endif()
+
+configure_file (
+ "${CMAKE_SOURCE_DIR}/src/cain.f90.in"
+ "${CMAKE_SOURCE_DIR}/src/cain.f90"
+)
+
 file(
 		GLOB
 		source_files
@@ -20,3 +31,6 @@ SET_TARGET_PROPERTIES(cainlib PROPERTIES LINKER_LANGUAGE CXX)
 
 install (TARGETS cainlib DESTINATION lib)
 install (FILES src/include/cainlib.hh DESTINATION include)
+if(DEFINED ENV{CAIN_COEF_DIR})
+    install (FILES src/FSU_mars90 DESTINATION ${CAIN_COEF_DIR})
+endif()
diff --git a/cainlib/src/cain.f90.in b/cainlib/src/cain.f90.in
new file mode 100644
index 0000000..ad5cfc1
--- /dev/null
+++ b/cainlib/src/cain.f90.in
@@ -0,0 +1,32 @@
+!----------------------------------------------------------------------------
+!   compute bcain 
+!   inputs:
+!         2) position dlat,dlong,alt
+!
+!   outputs:
+!         1) Bcain in MSO and IAU and it's magnitude
+!         2) index indacting calculation is ok
+!
+!-----------------------------------------------------------------------------
+      subroutine cain (dlat,dlong,alt,Btt,Bpp,Brr,Bx,By,Bz,B,ifail)
+!-------------------------------------------------------------
+!      DECLARATION 
+!-------------------------------------------------------------
+      implicit real (kind=8) (a-h,o-z)
+      external cread, gfield
+      character(2000) :: coeffs_cain_file ="@CAIN_COEF_DIR@/FSU_mars90"
+      integer l
+      common /trace/rm, maxln
+     ! real dlat,dlong,alt,Btt,Bpp,Brr,Bx,By,Bz,B
+      integer ifail
+!------------------------------------------------------------
+!     END OF DECLARATION 
+!------------------------------------------------------------    
+      rm = 3396.2
+      l = 1
+      ty = 1999.6493
+      open (unit=12,file =trim(coeffs_cain_file))
+      call cread (12,ty,l,maxln,a) 
+      call gfield(dlat,dlong,alt,maxln,rm,Btt, Bpp, Brr, Bx,By,Bz,B)
+      ifail = 1
+      end 
diff --git a/cainlib/src/cain.in b/cainlib/src/cain.in
deleted file mode 100644
index e60a9d5..0000000
--- a/cainlib/src/cain.in
+++ /dev/null
@@ -1,33 +0,0 @@
-!----------------------------------------------------------------------------
-!   compute bcain 
-!   inputs:
-!         2) position dlat,dlong,alt
-!
-!   outputs:
-!         1) Bcain in MSO and IAU and it's magnitude
-!         2) index indacting calculation is ok
-!
-!-----------------------------------------------------------------------------
-      subroutine cain (dlat,dlong,alt,Btt,Bpp,Brr,Bx,By,Bz,B,ifail)
-!-------------------------------------------------------------
-!      DECLARATION 
-!-------------------------------------------------------------
-      implicit real (kind=8) (a-h,o-z)
-      external cread, gfield
-      character(2000) :: coeffs_cain_file ="_path_&
-      &/FSU_mars90"
-      integer l
-      common /trace/rm, maxln
-     ! real dlat,dlong,alt,Btt,Bpp,Brr,Bx,By,Bz,B
-      integer ifail
-!------------------------------------------------------------
-!     END OF DECLARATION 
-!------------------------------------------------------------    
-      rm = 3396.2
-      l = 1
-      ty = 1999.6493
-      open (unit=12,file =trim(coeffs_cain_file))
-      call cread (12,ty,l,maxln,a) 
-      call gfield(dlat,dlong,alt,maxln,rm,Btt, Bpp, Brr, Bx,By,Bz,B)
-      ifail = 1
-      end 
diff --git a/cainlib/src/postcompil.sh b/cainlib/src/postcompil.sh
deleted file mode 100755
index b621850..0000000
--- a/cainlib/src/postcompil.sh
+++ /dev/null
@@ -1,3 +0,0 @@
-#!/bin/bash
-FULL_PATH="$(realpath "${0}" | xargs dirname)"
-rm -f $FULL_PATH/cain.f90
diff --git a/cainlib/src/precompil.sh b/cainlib/src/precompil.sh
deleted file mode 100755
index 17178da..0000000
--- a/cainlib/src/precompil.sh
+++ /dev/null
@@ -1,5 +0,0 @@
-#!/bin/bash
-FULL_PATH="$(realpath "${0}" | xargs dirname)"
-currentPath=$(echo $FULL_PATH | sed 's_/_\\/_g')
-cp $FULL_PATH/cain.in $FULL_PATH/cain.f90
-sed -i  -e "s/_path_/${currentPath}/g" $FULL_PATH/cain.f90
--
libgit2 0.21.2