diff --git a/build/pkgs/fflas_ffpack/patches/fix-ksh-pkgconfig.patch b/build/pkgs/fflas_ffpack/patches/fix-ksh-pkgconfig.patch
new file mode 100644
index 00000000000..fdaed2eebee
--- /dev/null
+++ b/build/pkgs/fflas_ffpack/patches/fix-ksh-pkgconfig.patch
@@ -0,0 +1,28 @@
+From 33a5ec4977f36ce3a24c9ee824d9dd053b8cea04 Mon Sep 17 00:00:00 2001
+From: Dima Pasechnik <dimpase@gmail.com>
+Date: Fri, 8 May 2020 15:55:27 +0100
+Subject: [PATCH 1/1] remove 1st and last file in .pc file
+
+this causes problem if building with ksh, as they remain, causing a broken .pc file.
+---
+ fflas-ffpack.pc.in | 2 --
+ 1 file changed, 2 deletions(-)
+
+diff --git a/fflas-ffpack.pc.in b/fflas-ffpack.pc.in
+index a2618d6..e34a744 100644
+--- a/fflas-ffpack.pc.in
++++ b/fflas-ffpack.pc.in
+@@ -1,4 +1,3 @@
+-/------------------ fflas-ffpack.pc ------------------------
+ prefix=@prefix@
+ exec_prefix=@prefix@
+ libdir=@prefix@/lib
+@@ -11,4 +10,3 @@ Version: @VERSION@
+ Requires: givaro >= 4.0.3
+ Libs: @PARLIBS@ @PRECOMPILE_LIBS@ @BLAS_LIBS@
+ Cflags: -I@includedir@  @BLAS_CFLAGS@  @PARFLAGS@ @PRECOMPILE_FLAGS@ @REQUIRED_FLAGS@
+-\-------------------------------------------------------
+\ No newline at end of file
+-- 
+2.26.2
+
diff --git a/build/pkgs/givaro/patches/fix-ksh-pkgconfig.patch b/build/pkgs/givaro/patches/fix-ksh-pkgconfig.patch
new file mode 100644
index 00000000000..28fd95088c8
--- /dev/null
+++ b/build/pkgs/givaro/patches/fix-ksh-pkgconfig.patch
@@ -0,0 +1,27 @@
+From 91dcba743e15288abe69966a5f71704d9adcc57c Mon Sep 17 00:00:00 2001
+From: Dima Pasechnik <dimpase@gmail.com>
+Date: Fri, 8 May 2020 10:22:57 +0100
+Subject: [PATCH 1/1] remove 1st and last lines in givaro.pc.in
+
+---
+ givaro.pc.in | 2 --
+ 1 file changed, 2 deletions(-)
+
+diff --git a/givaro.pc.in b/givaro.pc.in
+index 285b854..af38bf3 100644
+--- a/givaro.pc.in
++++ b/givaro.pc.in
+@@ -1,4 +1,3 @@
+-/------------------ givaro.pc ------------------------
+ prefix=@prefix@
+ exec_prefix=@prefix@
+ libdir=@prefix@/lib
+@@ -11,4 +10,3 @@ Version: @VERSION@
+ Requires:
+ Libs: -L@libdir@ -lgivaro @LIBS@
+ Cflags: -I@includedir@ @REQUIRED_FLAGS@
+-\-------------------------------------------------------
+\ No newline at end of file
+-- 
+2.26.2
+
diff --git a/build/pkgs/linbox/patches/fix-ksh-pkgconfig.patch b/build/pkgs/linbox/patches/fix-ksh-pkgconfig.patch
new file mode 100644
index 00000000000..e0cb575b1a1
--- /dev/null
+++ b/build/pkgs/linbox/patches/fix-ksh-pkgconfig.patch
@@ -0,0 +1,28 @@
+From 52c78df67a08de074991a93b57946b7bd5ea7196 Mon Sep 17 00:00:00 2001
+From: Dima Pasechnik <dimpase@gmail.com>
+Date: Fri, 8 May 2020 15:53:25 +0100
+Subject: [PATCH 1/1] remove redundant 1st and last lines
+
+they remain if the script is run under ksh, leading to broken .pc file
+---
+ linbox.pc.in | 3 +--
+ 1 file changed, 1 insertion(+), 2 deletions(-)
+
+diff --git a/linbox.pc.in b/linbox.pc.in
+index f54285e..eb6835b 100644
+--- a/linbox.pc.in
++++ b/linbox.pc.in
+@@ -1,4 +1,3 @@
+-/------------------ linbox.pc ------------------------
+ prefix=@prefix@
+ exec_prefix=@prefix@
+ libdir=@libdir@
+@@ -11,4 +10,4 @@ Version: @VERSION@
+ Requires: fflas-ffpack >= 2.4.0, givaro >= 4.1.0
+ Libs: -L${libdir} -llinbox @LINBOXSAGE_LIBS@ @NTL_LIBS@ @MPFR_LIBS@ @FPLLL_LIBS@ @IML_LIBS@ @FLINT_LIBS@ @OCL_LIBS@
+ Cflags: @DEFAULT_CFLAGS@ -DDISABLE_COMMENTATOR -I${includedir} @NTL_CFLAGS@ @MPFR_CFLAGS@ @FPLLL_CFLAGS@  @IML_CFLAGS@ @FLINT_CFLAGS@ 
+-\-------------------------------------------------------
++
+-- 
+2.26.2
+